ON the other hand...I have a Cody letter for my 1891 "73"....
I'm not a member of the Cody Museum , but a relation of friend is, he offered so, it cost me nothing except a deserved thank you ...
I did get the following interesting information
WINCHESTER MODEL 1873- SERIAL NUMBER 389XXX
Serial number applied on June 10, 1891
Type: Rifle Caliber: 32 Barrel Type: Octagon Trigger: Plain Received in warehouse on June 22, 1891 Shipped from warehouse on August 20, 1891, Order number 9607
However, mine being a emailed copy didn't have the really impressive letterhead.