18ct gold pocket watch by Charles Frodsham, estimated £1000-2000 at Cheffins.

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Horsley, ‘the father of neurosurgery’, was the first doctor in the world appointed to a hospital post as a ‘brain surgeon’.

In August 1911, while on holiday with his family in Rousay (one of the Orkney Islands off the north coast of Scotland), Horsely’s son, Siward Myles Horsley, fell overboard during a fishing trip.

A rescue party pulled him from the sea in serious condition but two boys, Alfred Hermisgarth and Robert Sinclair, had saved him from drowning. The inscription on the watch is: To Robert Sinclair from Sir Victor and Lady Horsley in grateful recollection of his prompt and kind action on 22nd August 1911.

It carries an estimate of £1000-2000 at Cheffins’ jewellery, silver and watch sale in Cambridge on April 25.