Sherlock Holmes And The Deadly Necklace (1962) is a sloppy, substandard entry into the Sherlock Holmes canon. It was made originally in English, and then dubbed in English with voices that don’t always match the faces. What were they thinking?
But, worse yet, while it’s derived from an authentic Holmes story, the derivation is distant, at best, and it is not clever. Instead, it’s about the ephemeral tension of a Holmes hunting Professor Moriarty hunting Holmes, and while that’s fun and all, it doesn’t match up well with the best the canon can offer.
Add in that Watson is once again a buffoon of little real interest, and this one’s a dud.