Palmetto Arms has a web site at www.palmettoarms.com
I was also trying to obtain information on my Gemmer back in Feb 2003. Here is the response that I received from my questions ...
'Sorry for delay in answering to your questions.I was between people around Washington and later New York under snow storms.
So, your questions are, if I'm correct, related to our old production of 45/70 made for Leonhard Allen of Santa Fe-New Mexico.
This small lot of approximately 50 pieces has been produced around 1984 for Allen Firearms in 45/70 and commercialized under the name "Gemmer Sharps" as copy of an original made by Gemmer, formerly last owner of the Hawken Shop of the Hawkin Bros. if I well remember of Saint Louis and well known customizer of cartridge rifles like Sharps and Remington Rolling Block with an old tast of the Hawken plain rifle.
The rifles in question, as all the guns produced in Italy, are mandamentary proofed from our official proof testing house in Gardone Val Trompia who is stamping main parts of the guns with their marks. All guns are tested, for protection of the consumer, with a smokless powder charge at least 30% higher than the stronger load at the moment commercially available on the market.
I don't remember the load used at that time.
I cannot remember and I have no records of the price at which that rifle was sold to Allen, but I think it was on retail at roughtly around 600 dollars.
If I can be of any further assistance don't hesitate to contact me again.