I just found this on a site I had to translate from Italian.
The second of these three Colt SAA is of particular importance because it bought expressly for himself, he was ordained by a letter which is still present in the archive of the Connecticut State Library, the letter is dated July 24, 1885 and is written on company letterhead Opera House Saloon.
Dall'appunto written from the clerk of the Colt seems that your order has arrived in the company on July 28.
Masterson The letter pointed out that the weapon had to have a high quality finish, and here the "our" used the phrase that is written in many books that talk about Colt 1873 SAA: "I am willing to pay extra for the extra work" , "I'm willing to pay more for extra work" (such as historical phrase will not be much, but infact 'is .....) In the letter recommends that the weapon has a "trigger very light and sensitive, a viewfinder is not very high but thicker section than those normally built, gutta percha grips and barrel as long as the rod extraction ( then a 4-3/4 inch) " There is also a postscript unreadable but that seems to indicate a desire to order two instead of one revolver , the hypothesis is supported by the fact that on July 30 from Hartford were sent to Dodge City two Colt, and both with the requirements to Masterson in the order letter. These two weapons had their serial numbers 112737 and 112998.
The two weapons SN# 112737 and 112998 are the ones shipped to Masterson July,1885 after Colt received the "Opera House letter" requesting two identical nickel 4 3/4" .45's with gutta percha grips, modified sights, and easy on the trigger. The 112737 gun has been more talked about than the other, and actually duplicated down to the original SN# 112737 by Pietta in a non-firing replica model. As far as the other, 112998, Ive only recently been able to find out it actually existed. I'm trying to find out if either of these is on display anywhere, and trying to find out which one has been found and which one hasn't turned up yet? I've seen the Commemoratives made in 1967, and I've seen the replicas modeled after these guns. Seems all I can find is one old black and white picture of the original, and only one. What ever became of these weapons people?