In 1960, producers Nat Cohen and Stuart Levy acquired the film rights to all of crime/fantasy/scifi/adventure writer Edgar Wallace’s books and stories. From Wikipedia:

The Edgar Wallace Mysteries is a British second-feature film series mainly produced at Merton Park Studios for Anglo-Amalgamated. There were 48 films in the series, which were released between 1960 and 1965. The series was screened as The Edgar Wallace Mystery Theatre on television in the United States.

The series’ opening titles are set in Imre Reiner’s Mercurius Script (Monotype, 1957) and a yet unidentified sans serif. It could be another typeface by Monotype – Headline Bold, or its predecessor, Stephenson Blake’s Grotesque No. 9.

[More info on IMDb]