Late 70's would have been too late for Ithaca SKB.
Concerning Japanese proofs being recognized in Europe . . . they're not part of CIP.
When I first started shooting skeet, my mentor had a Model 500 20ga. Tire weights taped to the barrels. That gun had been shot a LOT!
For those looking for something a little different in an SKB OU, look around for a 680. That's the OU with straight grip vs PG. While the 280s (straight grip sxs) are relatively common, you don't see a lot of 680s.
If you've saved old issues of Shooting Sportsman, I did two articles on SKB doubles back in 2003: March/April and May/June.
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