Disston made handsaws a long time ago. Often there was a logo etched onto the saw’s blade, and many of them were trademarked to keep competitors from putting a similar etch on their saws. As mentioned in my article on trademarks, 10,000 or so dead trademarks are not available on the US Patent Office’s site. The six Disston Keystone trademarks shown above, all registered on December 5, 1933, are among the ones not online. Fear not, I obtained copies of their registration certificates and pdfs of them are available on this very site
- 308510 K-4 Keystone Air Master
- 308511 K-6 Keystone Challenger
- 308512 K-5 Keystone Defender
- 308513 K-1 Keystone Leader
- 308514 K-3 Keystone Pace Maker
- 308515 K-2 Keystone Speedster
A friend of mine runs vintagesaws.com. For more information on Disston’s Keystone saws, check out this article.