i cant remember the SN all i know was that it was one of the first produced that went to a LH thread. i may be completely wrong here (like i said i dont know much about the numbers or what they are) but im almost completely positive it was a 29-1 with a 184xxx SN. but i was thinking that the -1 would be between 198-220 or somewhere in there. once again guys pardon me for my ignorance i just know that the gun was gorgeous and now im finding myself wanting to learn a little more about the model 29.