They are usually very good about answering enquiries, although no faster than any other gunmaker. On a pair I bought by accident at auction, they were able to provide dates and references to the store in Spain where the guns had been sold.
They are also great on service. One of the guns threw an ejector disk after many years of use, and there isn't any harder use that Spanish driven partridge. I wrote to ask if I could purchase a replacemant and I received, free gratis and for nothing, a rough. Still needed fitting, but the gun was a solid thirty years old. Non este mal.