Hello Mike: What you have is a tool check. These were used at the main and assembly plants. You were issued a number of these and if you needed a tool from the tool room you would leave this check with the tool room attendent. At the end of the day if you did not return the tool the tool room attendent knew who to look for. Yours has the early Ford design these were changed sometime in 1916, however they were more than likely used beyond that. I have one similar that has Olakhoma City on the front and the hand stamped # on the back. Very neat item. Gary