OKeh

TBC: Based on available releases it seems the text “Registered U. S. Patent Office” have disappeared from 1941 after cat. no. 6394. It it's confirmed it would help to review dates as part of the reissues are flagged with the original release date.
Be careful on color differences (pink vs. purple) it s not always just an effect of time/scan but real different releases as for instance those 2 differs also on text https://www.discogs.com/master/1355436-Count-Basie-His-Orchestra-Fiesta-In-Blue-Take-Me-Back-Baby or https://www.discogs.com/master/1673289-Benny-Goodman-And-His-Orch-The-Earl-Lets-Do-It
For vinyls, infos here https://books.google.fr/books?id=yLgYvg0F_34C&pg=PA20&lpg=PA20&dq=OKeh+label+pink+purple&source=bl&ots=8kVzGqMJCe&sig=ACfU3U1Usq74YH5NyOYzcUfYeZNwWQpW_A&hl=fr&sa=X&ved=2ahUKEwjdqbfVqbzzAhWeumMGHZLvA44Q6AF6BAgkEAM#v=onepage&q=OKeh%20label%20pink%20purple&f=false

currently, Sony Masterworks' primary jazz imprint.

Started in 1918 by Otto K. E. Heinemann.
Beside a regular melting-pot novelty catalog, OkeH ("Otto K") focused as well on the immigrant community by issuing records in various languages, then opened its door to the African-American's music and early jazz. (the stylized capital H reverted to "OKeh" probably shortly after 1919)
Columbia (still under ARC at the time) took Okeh over in November 11, 1926, and discontinued the label operations in 1935.
They revived it in 1940 until 1946 (having lost Vocalion), and once more in 1951 till 1965.
Epic Records eventually took over Okeh in 1965. before it was retired once again in 1970.