A mid-20th century brass cased two-day survey chronometer, No. 23251, the silvered circular dial with subsidiary state of wind and seconds dials, inscribed 'Thomas Mercer' and numbered '23251', diameter 12cm, within an aluminium cylindrical case with glazed cover, with original fitted canvas and metal mounted wood case, the hinged lid with applied plaque, detailed 'Survey Chronometer (2 Day) Contacts 23251 Vocab No V3-05-821A'.Buyer’s Premium 29.4% (including VAT @ 20%) of the hammer price. Lots purchased online via the-saleroom.com will attract an additional charge of 6% (including VAT @ 20%) of the hammer price.