Frankenstein Meets The Wolf Man (Realart, 1949 RR); US LC:
To me, this is easily the best Realart LC ever made and easily one of the top 5 Universal scene cards period.
It's the only card from the entire Universal series that pictures two monsters on it (there are a few card with Karloff/Lugosi, but not both as monsters, and there is a card with Strange/Chaney, but Chaney is not in make-up).
And not that anyone asked, but my other top 5 Universal scene cards would include:
Black Cat - Boris and Bela facing off in the map room
Bride of Frankenstein - The monster and the bride together
Invisible Man - Reins confronting Stuart
Dracula - Lugosi about to put the bite to Chandler