Based on the "Richard Diamond" radio program from 2/5/50, entitled "Timothy The Seal".
It is worthy to note the uncanny resemblance to the Vladamir Sokolawsky character (who would reprise this role in another episode) to that of Peter Sellers characters in future Blake Edwards collaborations.
The Russian character Vladimir refers to Peter Gunn by the Russian equivalent "Pyotr".
At 24:00 the vial of diamonds that the doctor hands to the lieutenant contains noticeably fewer diamonds than seen at the beginning of the episode.