I see that the spelling of "aqueduct" is different on the chip - it is "Acqueduct". Searching using that term I found this:

James Giambruno of Tunnel and Acqueduct
Workers Union No. 45, of Livermore.

In the
PIOCEEDIGS
of the
THIRTY-THIRD ANNUAL
CONVElNTION
California
State Federation
of Labor
Held at
MODESTO, CALIFORNIA
September 19 to 23, 1932

So I guess it is a California chip - almost a San Francisco one...