Hi there, I've decided to fix up an old Heuer 1000 (980.020) and I'm having a bit of a hard time finding the right type of crown replacement. I wondered if anyone might be able to shine some light on the subject. It seems to be a push-down, but every replacement I can find seems to be screw down. Hmm I'm also wondering whether the dial has tritium lume (no T-x-T on my dial, but every other 980.020X model does seem to have the tritium lume). It's clearly been re-lumed, but I'm just wondering what's underneath. Any help much appreciated.