Caliber : Cyma 920??? Diameter: 43mm./Excl. crown  Thickness: 7.5 mm

Name Cyma 920

Manufacturer Cyma

Launch Year 1920

Caliber Family Description

old designation / hunter / open face respectively

H= 5.35mm, normal stem mechanism:

19" B / 914 / 915: just separate cock for escape wheel

19" 2B / 920 / 921: 1 bridge, 2 cocks for train

19" 5B / 950 / 951: 1 bridge for train

19" 6 / - / - : 2 cocks for train

19" 7 / 970 / 971: just separate cock for escape wheel

19" 9B / 990 / 991: 1 cock for train, except center wheel

19" 10B / 900 / 901: 1 bridge, 2 cocks for train, excape-wheel cock modified

H= 5.35mm, negative stem mechanism:

19" 1B / 910 / 911: 1 bridge, 2 cocks for train

19" 3B / 930 / 931: 2 cocks for train

940 / 941 (Cyma 19" 4B): 1 bridge for train

19" 6B / 960 / 961: 1 cock for train

H= 6.7mm, negative stem mechanism:

19" 1 / 918 / 919: 1 bridge, 2 cocks for train

19" 3 / 938 / 939: 2 cocks for train

19" 9 / 998 / 999: 1 cock for train, except center wheel

H= 5.0mm, normal stem mechanism:

19" 15 / 954 / 955: 3 cocks for train

Related calibers

Cyma 19", Cyma 19" 1, Cyma 19" 10B hunter, Cyma 19" 15, Cyma 19" 1B, Cyma 19" 2B hunter, Cyma 19" 3 hunter, Cyma 19" 3 open-face, Cyma 19" 3B hunter, Cyma 19" 4B, Cyma 19" 5B, Cyma 19" 6 hunter, Cyma 19" 6 open-face, Cyma 19" 6B hunter, Cyma 19" 7, Cyma 19" 9, Cyma 19" 9B, Cyma 19" B, Cyma 900, Cyma 901, Cyma 910, Cyma 911, Cyma 914, Cyma 915, Cyma 918, Cyma 919, Cyma 920, Cyma 921, Cyma 930, Cyma 931, Cyma 938, Cyma 938a, Cyma 939, Cyma 940, Cyma 941, Cyma 950, Cyma 951, Cyma 954, Cyma 955, Cyma 960, Cyma 961, Cyma 970, Cyma 971, Cyma 990, Cyma 991, Cyma 998, Cyma 999

Is COSC certified No

Technical Details

Lignes Dimensions 19 ‴

Dimensions 43 mm

Height 5.35 mm

Further Measures Mounting Diameter (Dm): 41.7mm

Stem height (T): 2.2mm

Power Reserve 38 hours

Frequency 18,000 vph

Jewels 15

Complications and Specifications

Shape Round 

Complications

Sub Second 

Regulator Type Pinned Regulator (or Index Regulator) 

Movement Type Manual 

Escapement Type Swiss Lever 

Control Type Balance Wheel 

Winding Type Stem Winding 

Setting Type Stem Set 

Additional Information

Hand Sizes 1.78 x 1.12 / 0.2

Hand Count 3

Country Of Manufacture (not set)

Notes Remarks: hunter calibre

bimetallic screw balance

Breguet hairspring

Other data: balance staff: U252 stem: W255 mainspring / battery: 1.95 x 17.0 x 0.23mm balance staff ronda: 2274 (19) stem ronda: 262 (19) Mainspring: 1.900 x 19.000 x 0.230 x 480.000 mm

Signature ca. 1920: Tavannes Watch Co.* - 16743907 (16 jewels)

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