Assuming that this watch is a legitimate Patek, the following is from a Patek expert (not me): " Patek Philippe's first water-resistant chronograph wristwatch, reference 1463 was launched in 1940 and remaining in production until 1965. The pink gold examples of the model are much rarer than those in yellow gold or stainless steel, with only around 50 watches in this exquisite material known publicly. Of these, only a handful are fitted with a pulsation dial, very few including the present watch are confirmed by the Extract from the Archives. "
This watch is suited to a good quality black or brown Patek alligator strap with the appropriate gold buckle. There are a number of vendors in the USA that can supply these straps and pricing will run somewhere between $500 - $1000 with the matching Patek buckle.