I bought this sk 1/2 ratchet off of ebay, I am trying to get a view on how old it is, this is the picture off of ebay I will post better ones later after it is done soaking, but can anyone tell from the picture how old it is, the switch to change it from clockwise to counterclockwise is a push button right under the head it goes from one side to the other. It does not have a part number on it. Does anyone have an idea?