Original cover art for BORIS KARLOFF TALES OF MYSTERY #17
March, 1967. Most likely by George Wilson.
The first 2 issues were named Boris Karloff Thriller, after his anthology TV series.
The very first issue, dated October 1962 (so it went on sale about August), was only the third Gold Key offering since their creation by Western Publishing's break with Dell.
These first two issues were 80 pages priced at 25 cents.