Updated list
I think this is a really great project and I wanted to nudge it forward, so I took the liberty of updating the list and consolidating the comments made in posts, adding a few tidbits from my memory as well. Here goes, feel free to add on!
Adams -The budget brand of the day, Adam none-the-less made a dependable hat, and made sure that they copied the styles of the most popular hat makers
Bailey- Founded in 1922 by George Bailey. Still in production - http://www.baileyhats.com/
Barbisio- Italian. Was a competitor of Borsalino. Closed in the 80s.
Beaver Brand- Founded in 1860 in St. Louis, MO. Now based in New Haven, MO. Still in operation - http://www.beaverbrandhats.com/
Bates- http://www.bates-hats.co.uk/. London hatter established in the early 1900s and still in operation.
Bee Hats- Used to be located on Washington Avenue in downtown St. Louis. No longer in production as of 2000.
Biltmore-- Since 1917. Still in operation - http://www.biltmorehats.com/
Boldt’s of D.C
Bond
Borsalino-Italian. http://www.borsalino.com/ (site currently under construction). Still in production.
Brent- The name used by Montgomery Ward for their hats - no longer in production.
Buckley
Cavalier
Cavanagh -One of the premiere hat-makers in the 1930s, Cavanagh remained a premier hat maker through the 1950s, and made excellent hats into the 60s. Located in Norwalk, CT. Dobbs and Cavanagh formed Cavanagh-Dobbs in 1928. They added Crofut & Knapp to the fold sometime between March and June 1929. Hat Corporation of America (founded by Cavanaugh) took over in 1932.
Caxton
Champ-Considered a budget to mid-quality brand by many, Champ made a really nice quality hat, and though they were certainly not top-of-the-line, they had a lot of style!
Christy's of London - Founded by Miller Christy in a small courtyard shop off Gracechurch Street in the city of London in 1773 - still in production.
Churchill-A line of fine quality hats, the Churchill line was bought out by Resistol in the 1950s, though Resistol continued to produce hats under that name for quite some time. Citation- “hats of distinction”.
Courtney
Crofut & Knapp- Located in Norwalk, CT. Merged with Dobbs and Cavanagh in 1929.
Disney
Dobbs -One of the premiere hat-makers in the 1930s and 1940s, and still around today. Located in Norwalk, CT. Dobbs and Cavanagh formed Cavanagh-Dobbs in 1928. They added Crofut & Knapp to the fold sometime between March and June 1929. Hat Corporation of America took over in 1932.
Dunlap
Empire State
Francato Cappello
Flechet- Popular French hat manufacturer. Closed in the 1960’s.
Foreman & Clark
GH
Guerra
P. & C. Habig.
Hat Company of America-large conglomerate of hat companies by the 1960’s, but also manufactured hats under their own name.
Hatters Guild
Imperial
Jaxon
Knox - Located in Norwalk, CT. One of the premiere hat-makers in the day, along with Dobbs and Cavanagh, Knox positioned their hats as being the best money could buy, and had a knack for exploiting a market with slick advertising. Knox joined forces with Dunlap in 1918 and were later bought out by Byer-Rolnick (Resistol).
Kristall
Lamson-Hubbard Co. of Boston
Langenburg (Lion Hats)
Largomarsino
Lee -Lee made quality, but economic contract hats for JC Penney (Marathon) and such; while their own brand ran from mid-grade to fine quality. Probably the most prolific producer of hats for private labeling. Located in Danbury, CT.
Lincoln Bennett & CO. British hat manufacturer known for top hats.
Lock
Look & Johnson
MacLachlan
Mayser
Kevin McAndrew
Mallory-Mid to high quality hat brand. Located in Danbury, CT. Bought by Stetson in 1947 who manufactured high-end Mallorys under that name until the 1960’s when it was replaced by “Mallory by Stetson”
Manhattan
Melton
Meyer
Montecristi
Monterray
Morfelt-Established around 1879.
Mossant- France's most famous hatmaker from the golden era
Optimo-
Peschel
Pedigree
Perfect Hat Company- of New York with the slogan "Good as the Name"
Pilgrim
Portis
Resistol- (Byer-Rolnick) formed in 1927 and were eventually bought by Hatco in the 1960s.
Rothschild
Royston
Rundle & White
Scala
Schoble
Scott
Selco- store located in Brooklyn NY . They sold mostly Tonak hats from the Czek Republic . The store was located in Williamsburg Brooklyn .
Stetson-located in Philadelphia. Established in 1865. A premier hat company in the Golden Era who absorbed many high quality brands including Mallory in the 1940’s. http://www.stetsonhat.com/raw/index.html
Steven Stetson-of New York.
Stevens
Supernatural
Tilly
Trimble -Located in Orange, New Jersey, the Trimble Hat Company was a popular hat manufacturing company during the late 19th century and the first half of the 20th century.
Wasicka- of Cudahy, Wis.
Willoughby
Wormser -Wormser was considered a mid-range hat, though several were just as good as any vintage Stetson or Mallory. They had different levels of quality.
Worth and Worth
I think this is a really great project and I wanted to nudge it forward, so I took the liberty of updating the list and consolidating the comments made in posts, adding a few tidbits from my memory as well. Here goes, feel free to add on!
Adams -The budget brand of the day, Adam none-the-less made a dependable hat, and made sure that they copied the styles of the most popular hat makers
Bailey- Founded in 1922 by George Bailey. Still in production - http://www.baileyhats.com/
Barbisio- Italian. Was a competitor of Borsalino. Closed in the 80s.
Beaver Brand- Founded in 1860 in St. Louis, MO. Now based in New Haven, MO. Still in operation - http://www.beaverbrandhats.com/
Bates- http://www.bates-hats.co.uk/. London hatter established in the early 1900s and still in operation.
Bee Hats- Used to be located on Washington Avenue in downtown St. Louis. No longer in production as of 2000.
Biltmore-- Since 1917. Still in operation - http://www.biltmorehats.com/
Boldt’s of D.C
Bond
Borsalino-Italian. http://www.borsalino.com/ (site currently under construction). Still in production.
Brent- The name used by Montgomery Ward for their hats - no longer in production.
Buckley
Cavalier
Cavanagh -One of the premiere hat-makers in the 1930s, Cavanagh remained a premier hat maker through the 1950s, and made excellent hats into the 60s. Located in Norwalk, CT. Dobbs and Cavanagh formed Cavanagh-Dobbs in 1928. They added Crofut & Knapp to the fold sometime between March and June 1929. Hat Corporation of America (founded by Cavanaugh) took over in 1932.
Caxton
Champ-Considered a budget to mid-quality brand by many, Champ made a really nice quality hat, and though they were certainly not top-of-the-line, they had a lot of style!
Christy's of London - Founded by Miller Christy in a small courtyard shop off Gracechurch Street in the city of London in 1773 - still in production.
Churchill-A line of fine quality hats, the Churchill line was bought out by Resistol in the 1950s, though Resistol continued to produce hats under that name for quite some time. Citation- “hats of distinction”.
Courtney
Crofut & Knapp- Located in Norwalk, CT. Merged with Dobbs and Cavanagh in 1929.
Disney
Dobbs -One of the premiere hat-makers in the 1930s and 1940s, and still around today. Located in Norwalk, CT. Dobbs and Cavanagh formed Cavanagh-Dobbs in 1928. They added Crofut & Knapp to the fold sometime between March and June 1929. Hat Corporation of America took over in 1932.
Dunlap
Empire State
Francato Cappello
Flechet- Popular French hat manufacturer. Closed in the 1960’s.
Foreman & Clark
GH
Guerra
P. & C. Habig.
Hat Company of America-large conglomerate of hat companies by the 1960’s, but also manufactured hats under their own name.
Hatters Guild
Imperial
Jaxon
Knox - Located in Norwalk, CT. One of the premiere hat-makers in the day, along with Dobbs and Cavanagh, Knox positioned their hats as being the best money could buy, and had a knack for exploiting a market with slick advertising. Knox joined forces with Dunlap in 1918 and were later bought out by Byer-Rolnick (Resistol).
Kristall
Lamson-Hubbard Co. of Boston
Langenburg (Lion Hats)
Largomarsino
Lee -Lee made quality, but economic contract hats for JC Penney (Marathon) and such; while their own brand ran from mid-grade to fine quality. Probably the most prolific producer of hats for private labeling. Located in Danbury, CT.
Lincoln Bennett & CO. British hat manufacturer known for top hats.
Lock
Look & Johnson
MacLachlan
Mayser
Kevin McAndrew
Mallory-Mid to high quality hat brand. Located in Danbury, CT. Bought by Stetson in 1947 who manufactured high-end Mallorys under that name until the 1960’s when it was replaced by “Mallory by Stetson”
Manhattan
Melton
Meyer
Montecristi
Monterray
Morfelt-Established around 1879.
Mossant- France's most famous hatmaker from the golden era
Optimo-
Peschel
Pedigree
Perfect Hat Company- of New York with the slogan "Good as the Name"
Pilgrim
Portis
Resistol- (Byer-Rolnick) formed in 1927 and were eventually bought by Hatco in the 1960s.
Rothschild
Royston
Rundle & White
Scala
Schoble
Scott
Selco- store located in Brooklyn NY . They sold mostly Tonak hats from the Czek Republic . The store was located in Williamsburg Brooklyn .
Stetson-located in Philadelphia. Established in 1865. A premier hat company in the Golden Era who absorbed many high quality brands including Mallory in the 1940’s. http://www.stetsonhat.com/raw/index.html
Steven Stetson-of New York.
Stevens
Supernatural
Tilly
Trimble -Located in Orange, New Jersey, the Trimble Hat Company was a popular hat manufacturing company during the late 19th century and the first half of the 20th century.
Wasicka- of Cudahy, Wis.
Willoughby
Wormser -Wormser was considered a mid-range hat, though several were just as good as any vintage Stetson or Mallory. They had different levels of quality.
Worth and Worth