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Hi gang! Does anyone know if you need anything else to install an Athaya 702 crown onto a viet build? Or is it just a simple switch for any watchmaker as long as they have the crown and tube?
That would depend on several things, such as the supplier you purchased the case from, the case reference number etc. Beware of the forum parrots who tell you 'you're good to go bro'.
There is no such thing as a 'Vietnam case'. There are cases from suppliers in Vietnam, which may be more or less accurate to the genuine.
Cases from Kuared Watch for example are frequently not 'gen' spec''. They don't accept gen' spec' tubes, inserts, crystals etc.
Assuming you purchased the case from a reputable supplier and the model reference originally accepted a 702 tube/crown then an Athaya crown/tube will fit that case.