I just finished reading that old thread from the Archives. Interesting.
Unfortunately, catalog art is not necessarily indicative of what was actually
being made the year that catalog came out. When I say “actually being
made” I am referring to the physical characteristics pictured in the drawings.
Some catalogs contain drawings of headstamps that no one can prove, thru
existence of even a single specimen, ever existed. The Sales Department
of companies, which I would assume would often, if not always, encompass
the art department, is often behind the production division, sometimes by
a fair length of time. I would be surprised if any UMC headstamp was actually
applied to a cartridge after 1914, and perhaps even 1913. If so, it was probably
a very slow seller that did not warrant the expense of a new bunter.
My question was aimed at seeing if there was actually documention proving
exactly when the last cartridge struck with a UMC bunter was actually manufactured.
There does not seem to be.
There is documentation for the introductory date, often expressed as simply “began
making” or “commenced making,” for most of the calibers UMC manufactured. However, while their log
contains lots of interesting information of the bulk of the calibers, there are no
significant amount of entries from after the 1911 intitial merger date to tell us when
they stopped headstamping “UMC” on each caliber, and began using the
Remington-UMC and REM-UMC headstamps for each.