How can you date your historic Upjohn product? There are some
resources to achieve that.
The company name changed around 1907 from "The
Upjohn Pill and Granule Company" to "The Upjohn Company".
There were 7 logos over the company lifetime –
1886, 1894, 1907, 1913, 1938, 1945 and 1961. There is a
page showing them
on the web site.
There is a list of
all products from 1886 to 1950,
with the years that they were sold.
I have the Fluids Production log books from
1923 to 1939. This shows individual batch numbers. Alas, I only
have these books for fluids.
July 1st, 1963 was when zip codes
were introduced and used on company labels.