The auction house are selling 119 watches from the 2000-lot collection on bonhams.com. The sale runs from May 27 to June 9, with viewing on June 3 from 9am-4.30pm at Bonhams Knightsbridge.
Brands for sale include TAG Heuer, Jaeger-Le Coultre, Zenith and Breitling.
The entire collection is to be sold in instalments this year.
Further online-only sales are planned in different categories, the auction house confirms. “Bonhams has long recognised the importance of the online platform for our clients around the world,” Matthew Girling, Bonhams global CEO, said.
“The internet continues to grow as a trusted bidding method as we have seen from the many lots sold online.”