Hi Ash,
Great question. This particular watch is in the collection of TAG Heuer. It has the silver starburst dial, which was found on those a year or two after the earliest Carreras of 1963 and 1964. I suppose just looking at the dial it could date between late 1964 and 1966, but most likely I think it probably dates to 1965.
I wrote a dissection of the very earliest Carreras here and make reference to the fact I wish TAG had an early Carrera in the collection for their advertising of what the Carrera originally looked like, haha:
http://www.hodinkee.com/blog/understanding-the-earliest-heuer-carreras
The Carreras with 45 minute registers are powered by a Valjoux 92 inside and the retail price was $69.50 originally compared to $89.50 for those with the Valjoux 72. The Valjoux 92 was used until the later 1960s when they switched to the Valjoux 7730 with the 30 minute register. Offhand, I forget the year the transition occurred.
The nickname for these was the Carrera 45 and the one above has the reference 3647 S. The S stands for a silver dial.
You can see some photos of manual wind 1960s Carreras, including the Carrera 45, through this handy OnTheDash page:
http://www.onthedash.com/Guide/_Chronographs/63.Carrera/a.Manual_(1960s)/
Best regards,
Eric Wind
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