I've owned a couple of the Spanish double 10's over the years. First one was a club, shooting it was like trying to swing on a baseball by holding the bat at the wrong end. The second was extra heavy but a decent handling gun and was fair quality. I think both were Richardson imports if memory serves.
If you poke around on GunBroker you'll occasionally find a magnum 10 gauge double that's a Belgian import. The couple of those I've handled were very decent guns. Decent fit and finish, triple bite, even had a Greener style crossbolt. A buddy had one for sale last year that he'd had restocked to fit that I should have bought actually. I need a backup double 10 to shoot steel out of for the sad day when I finally run out of Federal Tungsten Polymer 3 1/2 shells for my Parker magnum.
Destry