Battery Box ID

[countrysquire]

Need a little help. Clearing out the storage building and came across this battery box. If my memory is working, I think that I got it with a bunch of spare parts when I bought my '40, but it doesn't appear to be right for a '40, so I'm not sure what it is, but would like to know before getting rid of it. As always, the help that I get here is appreciated.

 

[Lawson Cox]

It looks somewhat akin to the 39 Mercury, but it's been a long time.

 

[meric42]

I would think early '50's going by the method of battery hold down slots in the side of the box?