The milk bottle has the following information on it:

Capital G (on the inside of a circle) at the top ... THIS BOTTLE ... PROPERTY OF & FILLED BY ... O. H. GEYER ... & SON ... 7749 ... S.  CARPENTER ST. ... CHICAGO, ILL.

CHICAGO, ILL. printed near the bottom rim 

The other side has:  THIS BOTTLE NOT SOLD ... WASH AND RETURN ... HALF PINT LIQUID ... SEALED 51 ... U G P 51

Measures 5 1/2 inches tall x 2 1/8 inches in diameter at the top rim and 2 3/8 inches in diameter at the bottom rim

Weighs 10.9 ounces ... without the box and bubble wrap materials