What is the + Sign?
It is my opinion that it is the proof mark. It is placed on two points, which straddle the braze on a single assembly. It could not be put there until the barrel assembly was brazed. The fact that it is on both braze joints infers it applies to each barrel and not the assembly. It could advise the next stage of production the the barrel is large, choke,finish or fit to a larger frame, accordingly. It could also signify that both barrels have been proved and it is ready to finish.
Best, Austin
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