AM 395

 
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AM 395

Description

The movement shown here, an AM 395, is with a a diameter of 12 lignes a rather large, classically constructed mens’ watch movement with indirect center second.

It bases on the calibar AM 390, which is enhanced by a center second indication, but it is still marked as “AM 390” on the dial side.

Video on YouTube

The construction of this movement is really classy: The large screw balance, which is of course not yet shock protected, regulates a pallet lever movement and beats with 18000 alternations per hour.

The effective length of the hairspring, which is fix connected to the balance cock, is adjusted by a long regulator arm.

Since the base movement, the AM 390, only uses a decentral center second hand at “6”, all gears are on the same level of height.

without center second indication

without center second indication

For the center second mechanism, the third wheel has got an upper wheel connected to it on the outer side of the bridge. This wheel drives the small sweep second pinion, which is located under a tiny bridge with a jewel bearing. This jewel bearing is the 16th jewel of this movement, since here, as usual on old movement, the minute wheel is not yet ruby-beared.

A friction spring, which is positioned in a cutout of the main bridge, is responsible, that the center second runs smooth, since it gives a little tension to it.

main plate

main plate

On the dial side you see the yoke winding system with a very unique shaped setting lever spring and a partial helping minute dial, which was required in former times when the timegrapher was not yet invented, to regulare the movement without dial and hands.

AM 395 dial side view

AM 395 dial side view

Later on, the AM 395 was produced by Felsa as Felsa 395.

Timegrapher result

The specimen shown here was completely gummed and therefor had to be dissected, cleaned and oiled completely. The AM 395 runs very well in the horizontal positions. Why it has got very large deviations in the vertical positions is unknown.
crown right (12 up)

crown right (12 up)

crown up (3 up)

crown up (3 up)

crown left (6 up)

crown left (6 up)

crown down (9 up)

crown down (9 up)

dial up

dial up

dial down

dial down


horizontal positions
dial up-+0 s/d
dial down+10 s/d
vertical positions
crown right (12 up)+12. s/d
crown up (3 up)+240 s/d
crown left (6 up)+240 s/d
crown down (9 up)+240 s/d
Timegrapher output

Technical data

Manufacturer:AM
Caliber:395
Number of jewels:16
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • center second pinion
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
Features:SCI
Functions:hour, minute, second
A/h:18000
Size:12'''
Literature: Flume: (1947 40)

Usage gallery

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Links

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