An update - I received additional data today on S8136XX shipped in March 1946 - it has a 5" barrel, magna stocks, and a plugged swivel hole. In other words, just like the "SV" prefixed commercial Victory type, just no "V" - second one of these to be documented just in the course of this thread.

Although some of you may be too young to remember this, as Arte Johnson used to say, "Very interesting...."

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SWCA #590
"Colligo ergo sum"