Perhaps they were trying to expand their offerings, but here is a Keystone hand plane in the #4 size. It is marked on the 2" wide blade: Keystone Mfg. Co., Louisville KY and the body has Made in the USA between the front knob and mouth. Plane is 9 1/2" long. The lateral adjuster shape reminds me...
Info: https://www.garagejournal.com/forum/threads/spiral-ratchet-screwdrivers.391288/page-5#post-11487290
You need to unzip the files. Note: Each maker is on a tab at the bottom of the Excel files.
Need help identifying this block plane. It has an unusual lever made from stamped steel. There are no markings anywhere on the plane or the blade. It is coarsely finished.
Was thinking maybe a Sargent based on the A.A. Page patent 585889 (July 6, 1897) but they typically had a blade that...
Here are all my aluminum block planes. They include Foster, Utilaplane, one with casting numbers of P3958 on the body, 3959 on the levercap, and 3960 on the thumbwheel. The last one is umnarked.
I just posted my Pexto block planes here: https://www.garagejournal.com/forum/threads/peck-stowe-and-wilcox.370649/page-9
I happened to notice similarities between the Pexto design and an aluminum one made by Foster (1 Kinsey Buffalo NY, their address). Not saying Pexto made it because there is...