I have seen those as well. I can post a picture tonight but the ones I’m looking for have a smaller radius arch where the barrel meets the receiver.
The rounded part steps in, is the best way I can describe it. Most were, 20Ga, 410s, 30-30 and 22 hornet i think.
I have always heard them scalloped receiver/barrels called "pre 73". The ones I have are snap on forend with real walnut furniture. Mine are Topper 158's. Nice guns...good luck in your search. The scope mounts from Weaver that I bought for the 30-30 even said "pre 73" on the package.
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