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AS 740

 

AS 740AS 740

Beschreibung

The AS 740 shown here is a cylinder movement, probably one of the last cylinder movements by AS, for which existed spare parts until the 1940ies.

1926, AS, AM and FHF created the Ebauches SA for coordinating the ebauches production. From that time on, AS contentrated mainly on pallet lever movements, AM onto cylinder movements, FHF on lever movements and so on. So, the AS 740 might origin from the mid or late 1920ies.

base platebase plate

The gilt base plate still reminds a lot of old (cylinder-) pocket watch movements and is covered with lots of small holes.

gear traingear train

The gear train is absolutely typical for a cylinder movement with decentral second at 6 o'clock: Mainspring barrel - minute wheel - third wheel- large seconds wheel - cylinder wheel. Except for the cylinder wheel, all gears are beared under one single bridge, of which the bearings are just simple holes, no rubies. It's pretty hard to insert all the gears simultaneously.

side view of the gear trainside view of the gear train

The cylinder wheel and the flat three-leg anular balance are ruby-beared, but a shock protection is of course not yet used. Both have got their own cocks.

AS 740 dial sideAS 740 dial side

On the dial side, there's also nothing unusual, you can see here a rocking bar winding system with a very simple ratchet.

The speciality of the specimen shows here are its both hallmarks:

angular(!) AS hallmarkangular(!) AS hallmarkEB(!) hallmarkEB(!) hallmark

On the one hand a completely unknown  "AS" hallmark is used; on the other hand, on the movement side next to one of the dial screws another entirely unknown "EB" hallmark is stamped in. The latter would mean that the Ebauches Bettlach would have been involved in the production, which in 1932 joined the Ebauches SA. This in turn would mean that by 1932, according to the specialization of all, the two producers, the least expected cylinder movement manufacturers have produced this specimen, and not as AM or Felsa who were also part of the Ebauches SA since 1928 and well know for their cylinder movement production.

 

 Technical data

ManufacturerAS
Caliber740
Number of jewels6
Escapementcylinder
BalanceNickel
Shock protection(s)none
Balance cock directionclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionCenter second pinion
Fourth wheel, Third wheel, Center wheel, Mainspring barrel
Construction typesolid construction
Winding mechanismRocking bar
Setting lever spring4 holes
Featuress
FunctionsHour, minute, small second
Beats per hour18000
Size101/2''' (measured: 23,3 mm)
Image in Flume Werksucher 1947 102
Inventory ID 16002
AS 740ASAS74010 1/2'''AS 7406 Jewels, 10 1/2''', 18000 A/h, s
Factsheet

 

In the lab

The specimen here was resinified and got a full service. Since it is a cylinder movement, it could not be adjusted on the timegrapher.

 

Usage gallery

anonymous gents watchanonymous gents watch

 

This movement, which was indentified by Badener from the german UhrForum and the watch were kindly donated by Klaus Brunnemer. Thank you very much!