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Technical specifications
Opus Perpetual – Precision pendulum clock Cal. 2051
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Plates of 4mm thick, rolled brass
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48 ball bearings
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4 jewelled bearings in screwed-in chatons
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2 Agate pallets
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Pinions with high number of teeth (12 and 20) of hardened steel, polished
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Gears finely crossed out, milled, precision-ground, bevelled and gold-plated
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Graham escapement with improved transmission system
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Gold-plated escapement lever
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Suspension spring of rolled spring stainless steel
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Pendulum rod of heat treated super invar
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Pendulum weight turned of solid brass, nickel-plated
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Temperature compensation
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Double barometric compensation with 2x5 aneroids
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Adjusting-table
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Back plate of 6mm thick brass, nickel-plated
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2 pulleys with ball bearings
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Movement weight 6800 g, striking weight 6800g
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Blue steel hands, hand-domed
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Skeletonised dial, milled, anodised aud printed
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Bezel turned of solid brass, nickel-plated or gold-plated
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30 days power reserve
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Achievable accuracy: under optimal conditions deviation
of less than 2-4 sec./month possible
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Metal bar (Aluminium) with olive root wood cassette or carbon,
hand-polished
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Hand painted 3 dimensional moon phase with 10 diamonds
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Anniversary button with diamond, 6 jubilee jewels as indexes
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Limited and numbered to 60 pieces
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beat rate: 3600/h = 60/min
The accessory box
You will find the accessories as shown in the picture below in the including box. The pendulum
protection tube can be stored here.
Maintenance
As every other instrument of this kind your regulator also requires careful handling and
a certain degree of maintenance. We therefore advise you never to keep the clock case open
over a long period of time, in order to prevent dust from depositing on the clockwork.
After 10 years the latest you should entrust your pendulum clock to a competent clockmaker's
workshop in order to have the bearings cleaned and oiled anew. It will then untiringly do good
service over decades and will be passed on with pride from generation to generation as a pre-
cious chronometer.
Regulation weight Spare suspension spring Regulation pin
Tweezers Timing weights Crank
Pendulum
protective tube