I just scored two Super Speeds, 40's style, with no dates. I know they're 48 to 50, but I've heard that the 1949 SS came in a red bottom case. Both of these SS are in such a case, but in one the razor lies flat. In the other, there's a little ridge which makes the razor lie at a slight angle. Which one is the 1949 case? This is my birth year, so this is really important to me. Thanks.