This intriguing
39 mm platinum Minute Repeater, which could be a prototype as it is
numbered 0, and which is powered by
cal. 9890, was sold as
lot 60 last March, during Phillips' Watches Online Auction: The Geneva Sessions Spring 2025.
A truly good-looking piece, with its silver guilloché dial and blued leaf hands.
Best, Emmanuel
PS: if you're interested, I've posted more ref. 99500 and some ref. 99550
here.
credit: @watchesbylogan (1-2) & phillips