W. T. Co / (letter or number)
[1901-ca. 1924]
Pollard (1993:277) recorded this
variation, and we, too, have seen a single
example. It, too, postdates 1901. This
system may have been used in conjunction
with the “letter/number” system or may
have followed it. Until further evidence is
uncovered, this variation must also be dated
1901-ca. 1924.