Spanish guns are a good place to have fun. Here are some things to keep in mind.
Almost all Spanish shotguns are handmade, and individuals. Parts are not interchangeable between guns. The only spare parts that exist for a gun are the parts the buyer of the gun ordered made when he ordered the gun made.
Aside from firing pins, Spanish shotguns tend to last forever. Parts are hand fitted to close tolerances, wear is minimal, and the result is very long service lives. I have one live pigeon gun that was proofed in 1947 and appears to have been used on the pigeon shooting circuit. The owner had every part that had threads staked in place to keep parts from walking during a shoot. He also had a steel butt plate installed. The gun likely has a half-million or so shells though it, and still shoots well.
Serial numbers don't necessarily indicate order of manufacture, or any relationship between guns. It's not unusual to find two guns from the same maker where the higher numbered gun was made before the lower numbered gun.
Back before DIARM, just about all the makers offered guns at every price point. Everybody offered top end guns, and workingman's guns. There were no 'top end' makers; only top end guns. This is the origin of the advice, "Buy the gun, not the name."
Coming back to Jose Luis Urbiola, here are some photos of another Urbiola 12 gauge SLE







