Do you measure the crystal on the face or back?
Measure the widest dimensions top to bottom , side to side on the old crystal with a digital calipers, and then do the same inside the crystal groove on the bezel, write them down, they should be +/- .005mm of each other. Use a average measurment.
If this is the 1955 unknown, it is a Cushion style crystal. let me know the measurements and I will check the 1960 GS catalog that I have.
Greg
In reply to Geez Old Ticker, I almost by shooter144
In reply to Dead center with Paint... by OldTicker
In reply to There you go, ID'd and the by OldTicker
Hereafter's a little ditty I wrote about watch crystals... http://www.mybulova.com/node/691
Hmmm... 1955 "Ranger," or "Conrad?" With so few 1953- 58 ads for non "round" bezels (and no records!) maybe some day we'll know, for sure???
:-) Scott