"how do you tell the difference between a rust blue and a salt blue"....well I think the best example I can come up with, is the 7.65 and the 7.65 cross outs. WOL page 204, proof 166 states that the .30 cal barrel was rebored to a 9mm. However, the it has been determined that the original .30 cal barrels were take off and new 9mm barrels placed on. This make sence as to rebore a barrel would not, I believe be cost affective. So looking at a true 7.65 gun you can see the differences, though slight....hope this helps
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