GMT, I'm not a professional, but I do gawk at some of the vintage Rolex websites out there.
If I were a betting man (and indeed I am) I'd say you have a Rolex Bubbleback. Exactly which Bubbleback is hard for me to tell as Rolex wasn't nearly as "corporate" back then and there were many inconsistencies with mismatched dial/hand/crown combinations. Bubblebacks are more common than you'd think as lots of GIs picked them up during WW2 (and for years afterwards) and brought them home. I've seen some with very similar dials albeit with slightly different print. Again, the dial markings/hands/crown combo you have could well be very rare. I'll PM you with a link to a guy that has one somewhat similar to yours.