Good suggestion on the earlier rocker pivot markings, but they wouldn't be correct for the serial number that I had applied to the display receiver. I went with the number 15,607 for my receiver and trigger frame for the very reason you mention as to not be seen as a forgery or counterfeit Colt 1921AC. The SN is outside of the Colt SN block and is in the very early Savage model of 1928 serial number block so it wouldn't be mistaken as a correct, original Colt trigger frame. Although the rocker pivot markings are correct for both Colt and Savage, the way the SN is laid out on the trigger frame it is different from how Savage marked their serial numbers on their trigger frames with a S prefix. When you add in the couple of machining differences on my trigger frame (squared T slot for the magazine rib that you would see on M1/M1A1 or later made thompsons, and a radiused part of the trigger frame above the back of the grip where the grip area transitions to the stock slide portion) and compare them to an original, it should be quite easy for someone that is knowledgeable in thompsons to pick out as red flags.
As for the markings, a trophy shop that is just down the road from my house said that they could apply the markings and even allowed me to oversee the engraving to ensure that it would be placed properly. So by the end of the day on Thursday, I had the trigger frame engraved. With that hurdle out of the way, I decided to have a go at rust bluing the trigger frame to save some cash hoping that I would be able to make it blend together with the hot dipped P.O. 80% receiver. Mind you, it has been maybe 4 or 5 years since I last rust blued anything and I lost my Pilkington rust bluing instructions (can you see me already getting my excuses prepared for a lack luster job? Haha), so I tried my best to remember what process worked best for me. Fast forward to now, I just got done carding and applying wax to the trigger frame as it is looks pretty close to the finish on the receiver and I felt that another application of rusting solution would probably not yield much of a darker finish. It isn't the greatest job that I have done, but it works and it is close enough to the receiver finish for me (I have always had Pilkington's American rust bluing solution leave more of a dark blue/grey finish rather than a dark blue/black finish no matter if I go through 2 or 5 rounds of rusting/boiling/carding; I will get it figured out one of these days).
So here is where I am at with the trigger frame (sorry for the poorly done pictures). The next step is to either place an order at Las Cruces Gunsmith for a 1921 Colt style magazine catch, rocker pivot, and safety, or order a 1921 Colt profiled barrel from thompson barrels.com. It is slowly coming along.
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