Tissot calibre 781 Disassembly (Please sort the images by name in ascending order) Tissot calibre 781 Assembly (Please sort the images by name in ascending order) Tissot calibre 781 ranfft facts Some time ago my brother handed me this Tissot dress watch from the mid-1960s housing a Tissot calibre 781. My brother collects watches but doesn’t tinker with them (yet). Anyway, I thought it would be interesting to give this Tissot 781 an overhaul (you always learn something). It did see