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    Military Hamilton 3992B HS3 deck watch with Decimal dial c1940

    Military Hamilton 3992B HS3 deck watch with Decimal dial c1940

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    About this item

    This is a top grade Master Navigation pocket made by the Hamilton Watch Co, USA and used by the US government for military issue pocket watches during the Second World War. It was then sent to the UK where it was deployed by the Royal Navy and marked on the back with a broad military issue arrow and also HS3 markings.

    After the war the HS3 deck watches went into storage at the Chronometer Section of the Hydrographic Department at Hertsmonceaux Castle; there during the 1950’s they had the enamel dials replaced with special decimal dials, using smaller hour and minute hands. This indicated that the watches “time-telling” ability is of only secondary importance to their main intended function. The dial layout gives emphasis to minutes, which are picked out in red on the intermediate chapter ring and an outer ring has been calibrated to indicate 100 unites per minute. These watches were particularly useful for the rapid mathematical calculations, where time equations could be more readily determined and expressed in terms of decimals. 

    Source: A Concise Guide to Military Timepieces by Z. M. Wesolowski

    Movement – the high grade nickel ¾ plate movement has a lever escapement, a capped escape wheel and lever and a micrometer regulator. The movement has a wheel positioned on the top plates – this is for the centre seconds wheel on the dial. The movement is decorated with damascening and is signed “Hamilton Watch Co, USA, 3992B, 22 Jewels, US Govt, Adj Temp & 6 pos, 3C378. The movement also features a hacking function – when you pull out the winder the sweep centre seconds stops – vital for synchronising watches

    The movement is in 90% mint condition – light scratches

    Case – the movement comes in a base metal open face case, which has a screw off back and bezel. The case has engraved contract details on the back “Navigation Master Watch, Mfrs part 3992B, Serial No.839 1942 Hamilton Watch Co. HS3”. The case has engine turned edges and is in 70% mint condition – the usual wear on a military case with a round patch of wear with much of the engraving faint and hard to read 

    Dial – the repainted dial has three chapter rings – see the opening paragraph for an explanation for the function. The dial is in 100% mint condition

    The watch measures 51mm wide x 15mm deep

    The watch has a synthetic glass

    The watch is stem wound / stem set

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    Additional Information

    Code

    4.198 (AB-108111)

    Period

    Mid 20th Century

    Dealer

    Atlam Watches

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