Dear Amer,

Thank you for your compliments. I also noticed the two stamped triangles. However, I think serialnumber may be quite high for having housed a cal.11 initially...

It does have a caliber 12. I asked previous owner, who was a former retailer from the Heuer brand and he said the watch came to him like this halfway the seventies. I also did not find any kind of engraving or marking like Heuer used to do when a watch came in for service or repair inside the caseback.

Maybe Mr.Monaco or another top-expert in this field can share his thoughts on this issue??

Here already serial and ref.numbers


Have a great weekend all,
Abel.