Bulova 1956 Clipper

I believe this watch is a 1956 Bulova Royal Clipper. It was awarded to my grandfather, a State Farm agent, in recognition of his achievement in the 1955 State Farm Insurance sales incentive program known as Operation Flagship. The date code back is L6. The watch is original and has never been refurbished.

The watchband is a Speidel 10k gold plated design. I don't believe this is the original band. 

All other photos of Bulova Clippers from 1956 that I can find use a "6" with a standard typeface, whereas my watch uses what I call a "curly 6". There is an example of a 1957 Royal Clipper on MyBulova that features the "curly 6," but it utilizes the new style case that appears to have been introduced on 1957 Clippers and Royal Clippers. My watch features what I believe are called horn-style lugs and a stepped bezel. I don't yet have tools to open the caseback and look at the movement, but it appears to run fine.  I have a few questions:

• Was it unusual for a 1956 Royal Clipper to use a dial using the "curly 6"? Regular Clippers seem to use a standard 6 design.
• What movement would this likely have?
• Why did Bulova change from using the 10CSC movement to the newer 11ACAC movement? I'm assuming that the 11ACAC was improved in some way.
• Is it correct that both the 10CSC and the 11ACAC were both made in Switzerland?

Thanks  in advance for your help!