I can't say for sure about Rick's musket, but there was a limited run of Spanish M1757 muskets made in Spain in 1976, in honor of our bicentennial, and shipped over here. I don't know how they were allocated or distributed, but they had one at the Castillo in St. Augustine when I attended "the School of the Soldier" there a few years ago. I handled it. The musket was a very nice-looking and accurate reproduction, but it was my understanding that it had a few functional problems. That, and it's rarity, made it more of a collector piece than a shooter. Maybe Rick has one of those, although it might be one of the Rifle Shoppe parts sets, skillfully assembled. Maybe he'll tell us!
I have not handled the Pedersoli "Spanish" musket, but I did meet the owner of one, who said a little about it. Pedersoli evidently used their Charleville musket as a platform. They modified the markings on the lock, added a big ring to the top jaw screw, and modified the triggerguard with the lower sling swivel. The original M1757 had brass mountings, but I was advised that Pedersoli used steel and applied a brass-colored "powder coat" to those parts which were brass on the original. So, the Pedersoli Spanish musket pays homage to the M1757, but it is not an accurate replica.
I have a copy of James Levy's book on guns of the Spanish Main. Is that the one that was referenced, maybe? I also bought a copy of the Brinckerhoff book quite a while back. It should really be reprinted. I agree with tenngun, who said Spanish guns are under-represented, despite the fact that threads like this generate a lot of interest.
Best regards,
Notchy Bob