I think you're probably correct.
The problem for the OP is that he wants an EZ Cutter chisel which may be from H.W. Geller
H.W.Geller turner into Geller Ward & Hasner Hardware which lasted until about 1937 and the was sold to Shapleighs
Shapleighs acquired all of E.C. Simmons in 1940 and kept all the names like Keen Kutter.
In 1955 Shapleighs Hardware was sold to Curtis Mfg. Co which kept the name until the early 60's
Currently Val-Test Hardware Company of Schaumburg, Illinois owns the rights to the Keen Kutter and Diamond Edge logos today.
This is why it's hard to find accurate names dates and pedigree of old tools.