Bill,

The first picture on the picturetrail site is a Serial No. Estimate/ yr of mfg chart. This is an old sheet and some things have changed. I will look at my files when I get back to the house and let you know if I have any pertinent info on grades. Baker engraving varies gun to gun so it can be tough to identify using it. Barrel type divides the models. Guns mfg'd 1915-19 can be almost any configuration of parts and mechanisms.

Daryl will still be the "be all end all" contact.

John