A Bay State Hone

[dgc1]

I got a old hone today at a yard sale. It had printed on the side of it, A Bay State product No. A-69-70. Does anybody know anything about it?

 

[jc57]

Made by Bay State Abrasive Products Company, Westboro, MA. Business started in 1922.

What's left of them:
http://www.baystatesurfacetech.com/html/history.html

I found this interesting old catalog of theirs, though not specific to their sharpening stones.
https://archive.org/details/BayStateAbrasiveProductsCoAbrasiveProductsforBuild0001