Dave,
First off, let me apologize for not answering the PM that you sent to me. I have been away from home the past week (visiting beautiful Yuma, AZ
) and just got back to the computer. That being said, your best source for information is right here on the forum. Buckaroo Lou knows his stuff as do a few others who hopefully will join in (where are you Yahoody?).
You mention that your frame is "US" made. If so, then it would be a pretty good guess that the rest of your gun, minus, perhaps, springs and grip frame, were all "US" made as well. Lets face it, frame, barrel and cylinder are the "big three."
The two line address on your barrel only indicates that the barrels 4&3/4 in length or shorter. Longer barrels have the one line address (as was standard practice with Colt). No indication of Uberti manufacture there.
As for your gun falling into a "dreaded" serial number range, I doubt if such a range actually exists. Parts guns, US & Uberti mix, are still sought after by many. The only guns that bear a true stigma are those marked "USPt.FA."
You have to remember that USFA's transition from "Uberti parts guns" to "all US made guns" was a gradual one. An early made US frame, cylinder and barrel gun might very well contain Uberti grip frames, springs, hammers, etc.. Whatever was left under hand in the USFA shop.
When USFA started making all of their parts "in house" they duplicated Uberti, not Colt. Why? Simple! They wanted all of their "all US made" parts to be compatible with their earlier Uberti made guns and those containing Uberti parts.
Don't despair over your "parts gun" purchase. How does it shoot? I would take a "parts gun" that shoots off-hand 2" groups at 25 yards over an "all US made" USFA that gives me 4" groups. The most accurate SA I have ever owned (and between Colt, USFA, and 50 years of SA shooting, I have owned a BUNCH of them) is one of those "dreaded" parts guns… a nickel plated, 7&1/2" with one piece walnut grips. It was manufactured sometime around 2001 and I wouldn't give it up for anything. Off hand, it gives me that consistent 2" group that I mentioned.
Hope to see more of you here on the forum.
CJF