50th Anniversary Pocket Watch [message #17916] |
Tue, 27 December 2022 18:53  |
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kastner
Messages: 341 Registered: May 2013 Location: Pasadena CA
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Gruen Guildsman |
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Model name : 50th Anniversary
Type : Pocket watch
Period/date : 1924 (The movement was made in 1924, but it is unclear when this watch was cased and sold)
Gender : Men's
Case Maker : Gruen Cincinnati
Case Material : 18kt white gold
Case Serial : 1072311
Case Style no : none
Case Inscription (inside caseback): "Made Especially for Gilbert J Easton"
Caliber : See below
Movement Maker : Gruen
Movement Serial: 204
Movement details from Priceless Possessions of A Few by Fuller.
- 17-linge (approximately 10-size) open face, 23 jewels (21 extra quality ruby jewels, plus two faceted diamond cap jewels over escape wheel and balance wheel pivots on upper plates)
- 12kt gold plates (total 19 penny weight), individually engraved in floral relief pattern
- Steel cup in each counter-bored hole for plate screws
- Follow-up die used to slightly bevel around edge of spoke and inside rim of wheels
- Gold plated train wheels
- Chronometer style balance with solid gold screws
- Detachable staff which can be removed without disturbing relationship of balance hairspring, collet, and roller jewel
- Jewel pin fastened in balance arm with a bearing twice the length of the usual watch, making it doubly secure against coming loose
- Double steel roller
- Hand finished visible steel escapement with posing arms
- Patent micrometic regulator of continuous equal action
- Meantime adjusting gold screws
- True isochronal and Breguet hairspring
- Finest Swiss mainspring of lasting quality and great elasticity made by hand-rubbing so that the motive power is practically constant whether watch is fully wound or nearly run down
- Patented American pendant-set device of very few pieces
- Geneva style stop works and cut-away barrel bridges
- Eight adjustments to all positions, isochronism and temperature
- Fine Silver dial
- Patented inverted (Verithin) wheel train construction
- Extra finely finished in all details
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Re: 50th Anniversary Pocket Watch [message #17919 is a reply to message #17918] |
Wed, 28 December 2022 00:04   |
thesnark17
Messages: 627 Registered: January 2017
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Gruen Master |
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The detachable staff is a friction fit, and continues the principle of the earlier Chronometer Balance found on the V1, V2, and V3.
The earlier balance design integrates the roller jewel and double roller into the balance so that they cannot be removed, meaning that a restaffing will not disrupt their relationship. This design seems to take the idea even further. I would love to see a close-up of the balance removed to see how it works.
[Updated on: Wed, 28 December 2022 00:05] Report message to a moderator
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