### Instruction:
What was the most expensive watch ever sold at auction

### Input:
The most expensive watch ever sold at auction worldwide is the Patek Philippe Grandmaster Chime Ref. 6300A-010, which fetched 31.19 million US dollars (31,000,000 CHF) in Geneva on 9 November 2019 (by Christie's).

### Response:
A Patek Philippe Grandmaster was sold for a reported 31.19 million USD