I'm guessing a pint. There's only two listed so it shouldn't be too hard to figure which one you have. Is California spelled right or wrong? Those are the choices.
According Dick Roller's Standard Reference, Mission Mason jars were make c. 1926-1930's by the W.J. Latchford Co., Los Angeles. Redbook lists the pints at $8-$10 in either aqua or clear, the error jar ("Made in Califorina") at $15-$20. The half pints are the hardest to find, and will run about $100. -Tammy