Per Robert: "The most recent Evans catalog I found with the mold is a 1929 one."

Hunt Co Chicago also distributed the "C" mold. Hunt record below indicates they hot stamped the chip for EM O'Neil Co which was also in Chicago at the time. Was not unusual for an old distributor to do chips for another distributor. Several like orders in the Taylor records.
No date on the Hunt record.

Per Robert:. " Jim Blanchard says H. E. Mason & Co. once owned the mold"
1928-1956. Mason & Co., Newark NJ
Once we get access to the Mason records you might find later records for the "C" mold chips.