Here's a link to the form you can print out and send in. It's $75, and you'll get an official letter back from the historian, Roy Jinks, with the ship date, original configuration, some general details about the model, and where yours originally shipped to. Even if you don't get the letter, you might want to post some photos in the Revolver subforum-- I can think of a few people here who would be very excited to see that!
If 75 seems steep, keep in mind that Mr. Jinks will have to search through paper records to track that specific gun down, and then compose your letter.