Your watch is not from the 1950's. It's a ref.number 73321T from 1970. It is pictured in the 1970 Heuer Catalogue listed at the OnTheDash website. There is two versions, black dial, and white dial.
Your watch looks to be in nice original condition. This is NO Zodiac og Tradition with a Heuer dial, but ref. 73321 use a similar case as those two "Poor mans Heuers". The hands is the same as on the Carrera.

They are quite rare, rarer than a Carrera 45 with Valjoux 92. They are very similar to the Carrera 30 with valjoux 7730 also listed in 1970's catalogue.

Great watch!

Best regards
Jarl
www.classicheuers.blogspot.com