In contrast to the shell glass, mugs were produced for rugged, repeat usage.  One variety of mug produced for the Lemp Brewery is referred to as the 'picnic mug'.  These heavy, clear glass mugs were produced in a few varieties as shown below.

Ceramic mug with Sir John Falstaff on one side and the Lemp St. Louis shield logo on the reverse; 16" tall; circa 1900.