I'm trying to pin down a date on a 1950's J-45. It has a tapered headstock, cloth side supports, changed kluson to date tuners. I knew of the deceased original owner, so aside from the tuners, believe it to be original. It has a bunch of glue gunk on the neck block so I can't read a FON. Two questions: What year did they start the drop in bridge saddles and should I carefully sand on the neck block and see if I can discover a FON? I'm thinking 1950 or possibly 1949. It has a drop in saddle. Thanks. Look forward to the forum as I also acquired a 1950 Lg-1 (4627 4) and a 1950 Es-175 (A-5071).