Schlitz bottles. . . any ideas as to how old?

[watercolor]

I found these 32oz bottles inside an old shed on property that belonged to my grandmother's cousin back in the early 1970's. He was in his 80's when he passed away and that was in the late 1960's. Thanks in advance for any ideas you may have in dating these.



thanks,
watercolor

 

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[PBK]

Note mark on base of left bottle:

• W.F.& S. MIL.......See next entry.
• W.F.& S. MILW......William Franzen & Son, Milwaukee, WI (c.1900-1929). This mark is commonly seen on many beer bottles from the Midwest.

Source: http://myinsulators.com/glass-factories/bottlemarks3.html

 

[watercolor]

PBK. . . thank you for the info!

Thanks again,
watercolor