The card sure looks like a bingo card, with the 1-15 numbers in the 1st column, etc. through the 61-75 numbers in the 5th column. It may be from the era before the BINGO name was common. For example, Harrah's and others first called it TANGO and other names.

I think the card comes from the era when Venice Beach had an amusement pier. In fact, that's where Bill Harrah and his father got a start running something called the "Circle Game".

Was MIRROR the name of the game or a business? That I don't know. Could be either.

Look up Venice, CA on wikipedia, and it describes the amusement pier. (No longer there today). But Navy Street does still dead-end into the sand at Venice beach.

BTW, there was another pier, called Pacific Ocean Park (or P.O.P. for short), but it was at another location. Built in the late 1950's, but later closed and burned. Finally torn down / removed too.
Interesting reading on it too, on wikipedia, but I think it's too late to have a bingo type game there.

On a totally NCR note, there's a series of paintings by Richard Diebenkorn called the Ocean Park Series (because his studio was there). Wish I had purchased one of them in his early days -- never cheap (in the $10,000+ range even then, but now probably $1million+ each!! ...but I digress...