The later SKB imports--under their own name rather than for Ithaca--were definitely heavier.

I had to dig back quite a ways to come up with anything on 12ga Ithaca SKB Model 100's. I had a 200E made for the European market, but with a splinter FE like a 100. It weighed 6/10. And a standard 28" Model 100 at 6/13. Both with 28" barrels.

Two Webley & Scott 700 12's I had, both 28", weighed 6/7 and 6/8. So a few ounces lighter in favor of the Brits.