Buser 140

 
Buser 140

Buser 140

Description

The red-golden Buser 140, with its full size of 11 1/2 lignes, is a true gents’ watch caliber and it is a hot candidate for the title “most odd gear train”.

base plate

base plate

21 jewels on a windup movement normally indicate a high number of cap jevels, but not here, because on the Buser 140, we have an unusual high number of gears, all using rubies.

gear train

gear train

When looking at the gear train, you can only stow. No less than seven gears are used here, four are normal …

The pretty large, also red gold, mainspring barrel drives the center minute wheel, followed by third and fourth wheel. But now, the next gear is a steel transmission wheel, which drives by its outher teeth the center seconds wheel. This wheel now also engages with a second steel transmission wheel, which is highly toothed, and which now finally drives the steel escape wheel, also highly toothed.

The reason for this laborious and exhausting construction can only be guessed, probably there were patents for the center seconds indication which had to be bypassed.

side view of the gear train

side view of the gear train

A normal escape wheel has got only half of teeth on its drive, but not the Buser 140.

gearing of the escape wheel

gearing of the escape wheel

Another odd detail is the usage of a lateral lever, which has got an extraordinarily large lift angle of 59 degrees.

The monometallic screw balance, which acts on this pallet lever, beats slowly with 18000 A/h. It’s precise frequency can be adjusted with a long regulator arm, which crosses over a clear scale on the balance wheel cock.

detail: Lateral lever

detail: Lateral lever

As unusual the Buser 140 looks on the movement side, as familiar it looks on the dial side. Of course, the setting lever spring of the yoke keyless works is shaped in a distinctive way, but most noteably is the shock protection, since a rare Neutroshock-Bearing is used.

Buser 140: Dial side

Buser 140: Dial side

In the lab

The specimen shown here most probably comes from a golden watch, whose case was melted. Because of this, not much care was taken to seal the movement ouf of the case, you can see this on the damaged dial. Additionally, the movement was quite dirty, when it came into the archive.

Timegrapher result

With a simple service, the movement could be brought back to life, but its timing results are pretty poor. The low amplitudes are the result of a wrong life angle. Probably, a wrong (or damaged) shock protection of the balance wheel cock is also responsible for the not really "precision"-like results.

horizontal positions
dial up +146 s/d 155° 1.7ms
dial down +17 s/d 242° 1.7ms
vertical positions
crown right (12 up) +40 s/d 170° 1.7ms
crown up (3 up) +-0 s/d 136° 4.3ms
crown left (6 up) +9 s/d 146° 4.3ms
crown down (9 up) +58 s/d 138° 4.3ms

Technical data

Manufacturer:Buser
Caliber:140
Size:11 1/2''' (measured: 25,6mm)
Height:4,20mm
A/h:18000
Number of jewels:21
Balance types: Nickel screw balance
Shock protection(s): Neutro-Shock
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, transmission wheel
  • center second pinion, third wheel, transmission wheel, large driving wheel
  • center minute wheel, mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:6 hole(s)
Features:
  • SCD (direct center seconds)
Literature: Ebauches: 1953 II 37/1
Flume: K2 -
Inventory number:20044

Usage gallery

anonymous "Precision" gents watch

anonymous "Precision" gents watch

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