I have a Buco J-27 52 or 53 based on the first horse tag Buco used, after the two early Buco tags that did not reference horsehide. I believe prior to 52 Buco only use horsehide so the hide was not call out on their tags, I've handled early Sears mc jackets that are made with leather consistent with early 50s tan horsehide without horsehide on the tag
Comparing my Buco with the Allstate, the Buco has spots/false snaps at the top of the triangle above the belt loops, My Buco's hide seems stiffer but it has hardly been broken in, and the Buco appears longer? the back length of the Buco is 27"
I can not tell with the Allstate, but the Buco has a zip closure on the sleeves in addition to the strap & snap. I do not want to post a picture of the Buco it might confuse readers. This tread is about Sear mc jacket