Looking for the type and the "53".

The 53 is really unusual.
I don't recognize this photolettering era font but if you are in luck someone will. A modern font by Nick Shinn that is almost there
http://www.fonts.com/font/shinntype/brown-gothic/black-condensed
Don
Bob, Plak Blak is a good find. Plak Black Condensed is quite close for most of the letters in the image
Only the _S_ stands out as being too rounded. Perhaps this photo lettering era font is a revision of Paul Renner's design for Plak Black Condensed. Most people would not notice if it was used as a substitute for the letters, particularly if the _S_ is adjusted and the punctuation replaced.
The numbers appear to be from an entirely different font. If they had to be made from scratch, I would start with an _8_ to make the _3_.
Don
Captured from web.archive.org on 30 May 2017. view this capture