Paul,
 
        I don't know how much help this will be, but the manufacturer's mark
on the base is probably from the Armstrong Cork Co., Glass Division,
Lancaster, PA, used from 1938-1969 (Toulouse 24-25).  The mark was
used earlier by American Glass Works, Richmond, VA, and Paden City,
WV, 1908-1935 (Toulouse 23-23).
 
Toulouse, Bottle Makers and Their Marks, 1971, Thomas Nelson, New
York.
 
        The "Federal Law Prohibits. . ." warning did not begin until the end
of Prohibition, so the bottle was probably made by Armstrong.  *Most*
glass houses were embossing the year that bottles were made (at least
beverage bottles--sodas, milks, beer, liquor) by the early 1940s.
That makes the 48 a likely candidate for the year the bottle was
manufactured (1948).
 
        Hope this may be of some small help.
 
        Some of us are trying to put together a glass group to answer
questions such as this.  Are you interested?
 
Bill Lockhart
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(505) 439-3732