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AM 395

AM 395AM 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.

 

Construction

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 indicationwithout 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 platemain 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 viewAM 395 dial side view

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

 

 Technical Data

ManufacturerAM
Caliber395
Number of jewels16
EscapementAnchor with pallets
BalanceNickel screw balance
Shock protection(s)none
Balance cock directionclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Center second pinion
Mainspring barrel
Construction typesolid construction
Bridge shapeAxe, notch at mainspring barrel, 4 gears
Winding mechanismyoke
Setting lever spring3 holes
FeaturesSCI
FunctionsHour, minute, second
Beats per hour18000
Size12'''
Image in Flume Werksucher (1947 40)
AM 395AMAM39512''''''AM 39516 Jewels, 12'''''', 18000 A/h, SCI
Factsheet

 

Test Results

The specimen shown here was completely gummed and therefor had to be dissected, cleaned and oiled completely.

Timegrapher Protocol

The AM 395 runs very well in the horizontal positions. Why it has got very large deviations in the vertical positions is unknown.

crown rightcrown right crown topcrown top crown leftcrown left crown bottomcrown bottom 
dial topdial top dial bottomdial bottom 

vertical positions
12 up  +12. seconds/day
3 up  +240 seconds/day
6 up  +240 seconds/day
9 up  +240 seconds/day
horizontal positions
dial down  +10 seconds/day
dial up  -+0 seconds/day
timegrapher measurings
 

Usage Gallery

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