Title : The Silver Tombstone Mystery
Author : Frank Gruber
Cover art : Robert Jonas [?]
[New York : Signet Books, 1949. No. 689. "First printing, October 1949." Anonymous cover art, though some sources credit Robert Jonas.]
The uncredited cover art for Signet 689 dates from the company's pre-Avati period and features cartoonish tableaux of two tough guys scuffling, with screaming redhead nearby. Fun to compare the cover art of this version with the 1959 reprint [Signet 1677] by Bayre Phillips. I like the later version better.