I just bought a complete shop from the family of an old gunsmith that recently passed away. To get the few items I wanted, I had to buy everything. So of course some of the items I won’t be knowledgeable on, including these. I know what they are, I just can’t figure who made them and what they may be worth. I couldn’t find any comps on flea bay. The course stone is 6x12x1-1/16”, the medium stone is 6x10x1-1/8” and the unmarked black stone is 4x10x1-3/8”. Any help appreciated and definitely more to come. I removed 2 full pickup loads and an overloaded car load.