Thanks to your pictures, we can be sure S-17039 is not a Model of 1921 Savage. It is, or should I say was, a very typical Model of 1928 Thompson submachine gun manufactured by Savage Arms as part of the first contract with Auto-Ordnance Corporation, most likely in June 1940. The markings on the right and top of the receiver nose are British inspection markings, most likely at the Royal Small Arms Factory at Enfield or by an Enfield Inspector. There are others on this forum who are much more knowledgeable on the World War II British proof and inspections markings. Perhaps, they will chime in if additional information is warranted. The British markings on the top of the barrel are exactly like TSMG28 described above and were applied long after WW II ended. The markings on the left receiver nose are unique to me, and probably applied by some military organization while S-17039 was in-service. These are not Savage or Auto-Ordnance markings.
What makes S-17039 historic? It was manufactured by Savage Arms for the Auto-Ordnance Corporation as a Model of 1928A or without compensator. This was a very rare factory variation sold to the British Ministry of Supply (MoS) that ultimately led to the book, Great Britain - The Tommy Gun Story. Those members with this book can turn to pages 17 through 21 and read about this attempt by the British military to lower the costs of the very expensive Thompson gun. There is actually a little more information on this variation in the 2013 Small Arms Review magazine story, 3rd Quarter, Vol. 17, No. 3. As most of the long time members of this forum know, it was this story, and the fantastic research by James West, that allowed me to write the magazine story and later the book.
Those members who study the early Savage Thompson guns want to know how I know S-17039, a mixmaster of parts, has an original barrel? And front sight? Note the "S" marking on the left side barrel collar. Savage Arms manufactured most of the parts of the Thompson gun during the first contract of 10,000 guns. There were no assurances in early 1940 there would be another contract so subcontracting out the manufacture of specific parts, if it happened at all, was very minimal. But there is more. Note on the right side barrel collar the lack of an index mark. The lack of an index mark on Savage Thompsons was commonplace on the early guns. It was not until the 19,0000 to 20,000 serial number range a matching index mark started appearing on the barrel collar of the Savage manufactured Thompson guns. There is little doubt S-17039 was a Model of 1928A TSMG.
Known examples of original Model of 1928A Thompson guns include S-16739 and S-17359, both in museums in Great Britain. Note how S-17039 fits right in the middle.
A review of the markings of S-17039 shows the typical "GEG" or George E. Goll, inspector stamp on the left side upper receiver. Note the New York address and patent dates on the right side receiver. The New York address and 1922 patent date markings are similar to the late Colt's but not identical. Patent dates were changed to the commonly found patent numbers somewhere around the end of the first contract or 10,000 guns. The New York address continues on until the 80,000 serial number range - all fully detailed in GB-TTGS.
It does appear who ever converted S-17039 to the Model of 1921 variation added what appears to be the numeral 1 or vertical mark at the end of the factory applied "192" markings. I doubt any of the students that studied S-17039 in the past would have known the difference.
I find it amazing the frame serial number matches the receiver serial number. None of the fire control levers or the magazine catch are original. However, the ejector, while defaced, does appear to be an early Savage milled ejector. The actuator is definitely Colt's as is the cut-away buffer pilot assembly. A picture of the rear of the bolt is needed to ascertain the pedigree. The Blish lock is from the Auto-Ordnance Bridgeport factory. The wood not original; note the late stamped sling swivels. Again, a real mixmaster.
Aside from a picture of the rear of the bolt, I would like to see pictures of the front and rear of the front sight. I would not expect to find any manufacturer markings if S-17039 is like S-16739 and S-17359, above. This is not an M1 sight. The M1 sight did not become standard on Thompson guns until 1942. S-17039 was manufactured in 1940. I would also be curious if the front sight is pressed on or screwed on and pinned. Needless to say, the curators of the two Model of 1928As in Great Britain will never allow the front sight to be removed. Is that possible on this training gun?
Again, thank you for these great pictures. Any additional pictures would be great.
The second training weapon referenced in Frank's American Thunder III is pictured on page 350. It appears to be a late model Thompson gun based on the smooth barrel and compensator. I am curious if a serial number is present. The right side receiver markings will most likely tell the pedigree. I know pictures of that cut-away would also be well received on this forum.