Very nice set you have there. Bela is still employing the accent over the "s" so earlier 1940's. I have a set too - another duo - 1945 matching album page sigs and a Violet Zane 1952 candid:
Yes, 1947 was the last year Lugosi used that accent over the "e" so right in line. His graph starting getting shortly afterwards due to eyesight. You'd think his favorite ink color would be red but he loved green.