This is quoted from a very useful reply to an email I sent Martin about a Custom Pro that I bought, #VA027XX, on ebay, and the seller also “sold” me a huge cock and bull story about his uncle buying it in Nashville in 1992. It’s a great guitar, one of the finest I’ve ever played, but a “transitional model”. It may help others in determining origins of their guitars. Quote below:
This guitar is what we call a ‘transitional guitar’. One of my necks but the body is most likely made by Samick. The Neck is a Standard Pro. The nomenclature at the end of the neck is production ‘jibberish’ code but the BM-E is of course Birdseye maple / ebony.
99.9% up to s/n 2400 is almost all mine but after that it starts to get very ‘iffy’. While in transition Samick was pulling what ever parts they found in the shop and put them together. My guys did they best they could. Right after the ‘take-over’ Samick discontinued the SP because they were going to come out with there versions. So many of the SP necks became CP.
The term Bent S stood for Bent figured top. We bent the figured top over the arm contour. In your guitar its a ‘quilt-ish’ top. It looks like its on a alder body which my Bent S were. My Bent Top backs were painted black.
This guitar is one of the most popular we made, no wonder Samick kept it going. This is why I’m doing this in my de Erro Guitars. I make a Bent Top as well and all my guitars right now are 7/8, Gibson Scale. I do Quilt, Flame and California Myrtle.
Please, please don’t think I’m commenting on the quality of the guitar. My guys still gave their all. And you loving it is the most important thing!
Hope this helps! Don’t hesitate to write!