After years of research, I was able to conclusively show that bilbos did indeed "go to sea". This seems like a foregone conclusion based on movies, auction sites appealing to the naval collector, etc, but it was actually more complicated than that. These swords were primarily used by ground troops/soldiers. Even in the New World, sentries guarding the keeps at St. Augustine and Puerto Rico would have been so armed. I had seen famous paintings of Spanish admirals so adorned with the bildo and other cuphilts, but we all know that studios often used such props as...well, as props! It was only after learning that the Spanish and Portuguese Treasure ships coming back from the New World had contingents of soldiers aboard, both to defend the ship and also guard the treasure/discourage mutiny. In later times, the Royal Marines of the British and U.S. marines onboard early American ships followed suit. The point being, these bilbo broadswords and cup hilt rapiers were used by said soldiers and officers aboard ships.
Whew, now after all that, I'm not sure if this one fits into that realm versus a dragoon unit or some such-
