AS 740

 
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AS 740

Description

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 plate

base plate

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

gear train

gear 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 train

side 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 side

AS 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 hallmark

angular(!) AS 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.

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.

Technical data

Manufacturer:AS
Caliber:740
Number of jewels:6
Escapement:Cylinder
Balance types: Nickel anular balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • center second pinion
  • seconds wheel, third wheel, center minute wheel, mainspring barrel
Construction type:solid construction
Winding mechanism:rocking bar winding system
Setting lever spring:4 hole(s)
Features:s
Functions:hour, minute, decentral second
A/h:18000
Size:10 1/2''' (measured: 23,3mm)
Literature: Flume: 1947 102
Inventory number:16002

Usage gallery

anonymous gents watch

anonymous gents watch