Sometime in the 1950s the owl logo transformed into an owl wearing a deerstalk and smoking a pipe. Did some Cockney punning artist decide to come up with Sherlock Owlmes? Unfortunately I fond only one example of this logo in 1952 an nothing afterward. I'm guessing it was just a short-lived as the first owl logo.
Below are examples of dust jacket art and illustrated boards from 1932 to 1952, the only years I can verify when a Holt Mystery imprint existed.
|Pictorial boards and for some odd reason the author name is absent|
The book is by Donald Clough Cameron in case you're wondering
|1952 - new "Sherlock Owlmes" logo|
Appears on a few books in 1952 and 1953, then discarded