What is the maximum amount of watches do we allow to get the tax refund in Switzerland? And any limitation? Thanks!
There isn't a maximum - you can buy as much as you like except that as this particular concession is for personal consumption, if you were to buy 20 watches at a time they might consider this a commercial purchase: in which case, you can still buy tax-free, since the goods would be leaving the country but must complete commercial export formalities. There is a MINIMUM value of 400 CHF, see [original link].
Of course you also have to consider the duty-free limits for personal imports into your country of residence, one watch might be within it but several might not be.