Who did this work?

[Mills]

They do. Thanks Gary

[Drew Hause]

Thanks for finding those barrels Gary.
Steve Tasitritsis 'ATLAS ARMS', was at 2704 N Central, Chicago and (later) 7952 Waukegan Rd. Niles, Illinois. The replacement barrels for Smith and Parker guns in the 50s and 60s used tubes made by E.S.C. Vickers (England) and were fit and finished by Armaf in Belgium.
If the Winchester 21 barrels were Belgian or Italian they should carry proofmarks. Very interesting. And what was the source of the "Special Nickel Chromium Steel" tubes??