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I have two types of locks on the back door of my Watling machines - one has a Mills like key and the other a Corbin like key - which is correct?

Mills like:



Corbin like:

The Corbin style is the correct key for Watling slots. The Mills cut was for other mechanicals like scales and arcade machines.

We are all operating from the basis of a fairly low population of examples. I have had five Rol-A-Tops and four Treasury machines. My most original Treasury which I believe is bone stock original (later non-American coin Gold Award nickel model) has the Watling "Mills snake" type lock and key. I believe that this is the original lock and key. Think there are many variations in what Watling manufactured, assembled and released over the years.

Watling used Yale keys too!