There have been several wall boxes for Seeburg Coin pianos on eBay
auction.  The enclosed picture shows three Seeburg wall boxes.  The
two on the left are original and made of aluminum, and weigh almost
nothing.  The one on the right is a reproduction of nickel-plated brass
and it weighs several pounds.  It was made in the 1970's by a restorer
in California.

The coin entry on the two original ones have a lip on the front, while
the reproduction is flat.  Most of the original wall boxes used a flat
key like the one in the center of the photograph.    I do not know of
any original Seeburg wall boxes having been made of brass and then
nickel plated, but I have not seen them all.

Don Teach

 [ Now at http://mmd.foxtail.com/Pictures/seeburgWallBoxes.html
 [ -- Robbie