I unpacked by NTGS50AA board this evening. Fortunately, the "used" sticker attached by the seller was small and easy to remove. On mine, the 10 MHz oscillator says "Trimble" and has a part number of 34310-0 with a date code of "0002". It has a S/N of 1669-12028. I hope that this is of use to someone. Fred W6WAW