Bob, I think 7.65mm is not as popular, simply because of cost. Cartridges cost so much more, 9mm is so cheap, that 7.65 just doesn't seem worth it. But, for an average 30 Luger, i.e. 1923 Commercial (old name), they are about the least valuable, even in really nice shape.
A nice matching in reasonable shape will go up in value, a nice but mismatched one will rise much slower...
Ed
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