6 5/8 stratoliner

[Wally in Cincy]

http://www.ebay.com/itm/VINTAGE-JOHN-B-STETSON-STRATOLINER-FEDORA-HAT-WITH-10-TAG-SIZE-6-5-8/271223867181?_trksid=p2047675.m1982&_trkparms=aid%3D333005%26algo%3DRIC.FIT%26ao%3D1%26asc%3D15881%26meid%3D8566913894455625845%26pid%3D100009%26prg%3D7473%26rk%3D4%26sd%3D141000158643%26#ht_1059wt_1170

I don't recall seeing many hats this small.