I purchased a used Heuer 2547 First Series a couple of months ago and I sent it to my watchmaker for a service. I believe these are pretty rare, but maybe someone here on this forum can give me some idea of rarity and value. When I receive the watch back from the watchmaker I might be able to post photos, although I don't have any access to a hosting service. The watch has the fat lugs and screw back case. The case and dial are in great shape and the luminous on the hands match the dial luminous. Thanks for any information you can provide. Bob