49 watches from the private collection of Prof. F. A. Porsche of the famed sports car marque and his sons will be auctioned by Bonhams on Dec. 2 in London during its Fine Watches and Timepieces sale. Included are timepieces by Eterna, Porsche Design, Rolex, Panerai, Jaeger LeCoultre, Breitling, Chronoswiss, Omega and more. Of particular note are prototypes and unique examples of Eterna and Porsche Design watches custom made for the Porsche family. The latter includes a fine 18 carat gold chronograph (above) made especially by Eterna (now owned by Porsche) and presented to Dr. Ferdinand Oliver Porsche for his 40th birthday, estimated at £4,000 - £6,000. Also included in the collection is a very rare Rolex Explorer with ivory dial (£,5000 -£7,000), a selection of Panerai watches including a Luminor Flyback (£3,000 - £5,000), and an original Jaeger LeCoultre Polaris from 1960 (£5,000 - £7,000).