New to the forum. Many many pics of 2 biker-style jackets.

[Edward]

Its not lamb or calf.

Its not thin, as you can see where it "stands" it is still hard even after
all this use.

It could be cow. There is thinner leather in the highest part of the back.
I got a hole there when a cat tried to jump up and fell down and put a claw into the jacket and got hanging there until I helped it
Rest of the jacket is very very hard and it squeaks alot.
I did cover it in chao-co-line (spelling) once to soften it, but that's all I have ever done.

Yeah, sounds like Cow is probably it. Often you do find a softer panel here or there - variances of the natural hide.... my Brando style has a markedly softer panel on the underside of the collar. and ho, yes, I know all about what cats can do to leather. I have a beautiful leather chair that is well scratched from a time when one of mine developed a thing for sleeping on the back of it, but she was too small to be able to jump up and land there on her feet - lots of scrabbling..... arrgghh.