ranger1385,
That particular Savage Thompson on gunbroker has my attention. And yes, I have seen this handiwork previously. Those that have my book, A Thompson Compendium, can find five Auto-Ordnance Bridgeport (AOB) 1928AC Thompson guns pictured with these same milled oval shaped markings. All five are from the Connecticut State Police. Unfortunately, the earliest IRS forms available on these five guns are copies of the 1986 (Form 4467) Amnesty Registration forms that were (fortunately) retained by the Connecticut State Police. The Amnesty forms do state the guns were obtained January 1,1947. I believe this date is just a guess on the part of the official filling out the form. A FOIA request on one of the five revealed the ATF does not appear to have a copy of the original Form 4467; go figure! I would guess these five were sold to the Connecticut State Police by the Auto-Ordnance Division of Maguire Industries. I cannot explain the lack of a 1940s IRS Form 5 like is found with many other 1928ACs.
All five of these 1928ACs (and a Savage Commercial) recently obtained from the Connecticut State Police were displayed at the Hill Family All Thompson Show & Shoot several years ago. You never what is going to be displayed at these great Thompson events. I know a few have been sold. If the new owners would like to file a FOIA request, feel free to reach out to me. Different Disclosure Clerks often find different information.
From there the plot thickens. Another very early serial numbered 1928AC with the milled oval shaped markings was located. Fortunately, the owner had thoughtfully acquired and saved the original Form 5 registration paperwork. This 1928AC was sold to a New York Police Department in 1952 by Numrich Arms Company. This 1928AC was most likely one of the guns/receivers found in the crates by Numrich Arms when they purchased all the Thompson assets in October 1951.
More information about all these 1928AC Thompson guns, including pictures, can be found in, A Thompson Compendium.
My years long research of the AOB 1928AC Thompson guns has not revealed the Auto-Ordnance Division of Maguire Industries sold any Thompson guns with a Savage or Colt manufactured receiver. This Savage Thompson, S-161405, may be an exception. If Thomson guns were priced at $1000, I would buy it just to file a FOIA request. I cannot pony up 25K for research purposes. That said, if anyone knows anything about this unusual Savage Thompson, please reach out to me. It first surfaced at Rock Island Auction in 2016. I am hoping to contact the new owner when sold so a FOIA request can be filed. Perhaps the answer may be revealed in the early registration documents.
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