Upvote:1
For domestic flights there is no custom but better carry a purchase bill for that. CISF Guard checks hand luggage where baggage gets checked by the Airline Carrier itself - i.e. putting something in big baggage is less problematic.
Upvote:3
As this is an internal flight within a single country (India), there's no customs. I did a domestic flight this year and can confirm this.
There is security checking, and obviously there's the usual rules around batteries and the like, but a watch should not be a problem at all to take in carry-on.