The date is off if this item is for the Gray automobile made by the Gray Motor Corporation. They were in business from 1920 - 1926, but only made cars from 1922 - 1926. The Gray Motor Company made motors for several assembled cars prior to 1922, so if the pictures are of motors, that may explain the date being 5 years before the Corporation that made the cars existed.
Hard to put a value on this item without pictures. I believe the value would be modest - there are not many of us looking for items associated with the Gray Motor Corporation and its cars. I, however, am one.
Could you double-check the date and tell me what the pictures are of?
Thanks,
Jim Gray jrg240z@cox.net