Horological Meandering

... a recent catch. This is a Heuer Calculator reference 110663 from the early 1970’s. It has a really big case of 45,5 mm and a very large bezel which works as a calculator rule to translate measurements of speed, length, weight, etc from imperial to met...  

Thank you for the introduction of such a tool watch. Size is big but with all the information it makes sense to go big. Congratulations to it.