I am looking at this on ebay and a couple questions come to mind, 1) what is the value of this slot 2) do the 40's slots have serial numbers in the casting like the 30's? and if not where would it be? I have found a lot of info on fakes and how to spot them but they are mostly on the 30's stuff, is any of it the same on the 40's slots?
In looking at this slot more it says Jewel on the front the other ones I have seen say Mills, which should it be?
