Description

    Hamilton Model 505C Wear-Tested Calendar Electric, Never Marketed
    Case: single body, stainless steel, 35 mm, stepped bezel, curved pointed lugs, interior inclined engraved minute ring
    Dial: silver, applied gold numerals at 12, 6 and 9, date aperture at three, luminous steel hands
    Movement: model 505C, electric
    Band: Hamilton leather strap and steel buckle

    Note: In a traditional spring driven watch the date wheel is moved only once a day at midnight. The rest of the time it must be firmly locked in position to prevent it from being accidentally indexed by shock or vibration. The excess energy stored in a mainspring is easily transferred to the release mechanism, but in electric watches the delicate floating train lacks sufficient power to change a traditional calendar mechanism. In 1962 Jim Reese devised a shutter mechanism operating in tandem with a continuously driven date ring, rotating at a rate of 1/31 revolutions per day. the spring loaded shutter runs at the the same speed, so the date ring numeral always coincides with the opening in the shutter. The date window on the dial is twice as large as the numeral. As the date ring slowly revolves, the numeral moves downward, framed by the shutter, until at the bottom of the window the shutter is triggered to snap up to the top to reveal the next date. The system required very little power but it was difficult to control the precise time at which the shutter would index to the next date. It also lacked a separate setting mechanism for the date, making it very difficult to adjust the calendar. Consequently the 505C was never marketed. This watch is documented in "The Watch of the Future" on page 91.


    Condition Report*:

    Type: Hamilton Model 505C Wear-Tested Calendar Electric, Never Marketed
    Dial: silver, applied gold numerals at 12, 6 and 9
    Hands; luminous alpha hands
    Metal: stainless steel
    Case Info: single body, curved pointed lugs
    Case Width: 35 mm
    Crystal: acrylic
    Watch Movement: model 505C, electric
    Band: Hamilton leather strap and steel buckle
    Circa: 1962
    Condition: dial is very good, case is very good, non-running


    *Heritage Auctions strongly encourages in-person inspection of items by the bidder. Statements by Heritage regarding the condition of objects are for guidance only and should not be relied upon as statements of fact, and do not constitute a representation, warranty, or assumption of liability by Heritage. All lots offered are sold "AS IS".

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    Auction Info

    Auction Dates
    October, 2015
    29th Thursday
    Bids + Registered Phone Bidders: 4
    Lot Tracking Activity: N/A
    Page Views: 577

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