Hi, I came into posession of this Croton Aviator Sea Diver. I believe it is from the late 60s or early 70s. I had a jeweler open up the movement and it appears to be a Landeron 248. There is no import code stamp but it says Croton and some other markings on it. The caseback is stamped Croton Watch Co Inc Swiss. Does this look correct for this watch? Just trying to make sure the movement matches up. Thanks.