Baumgartner 866 CLD DIG

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Baumgartner 866 CLD DIG


The Baumgartner 866 CLD DIG, which was launchen probably in the late 1960ies, is one of the most unusual variants of the very popular caliber 866. With a digital hour and minute indication and a calendar, it it maximally equipped.

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As common on Baumgartner movements, this caliber is also a pin lever movement with a Roskopf construction, which means, that the minute wheel is located on the dial side is an driven, like the hour wheel, by a gear on the mainspring barrel, which is connected with a slipping coupling.

Due to this construction, the mainspring barrel can be very large and even overlap the center of the movement, and together with an also large second wheel, one transmission step can be saved.

Baumgartner 866 CLD DIG: gear works

gear works

The center second is indirectly driven, 1:1 by the outer teeth of the third wheel, which is located at 3:30 o’clock. There’s no flattering or bucking, even without a friction spring.

Baumgartner 866 CLD DIG: side view of the gear works

side view of the gear works

The realisation of this movement is very simple; besides the upper balance wheel bearing, there are no bearing jewels, but only simple drillings on the plates. For a watchmaker, it’s a bit time consuming to re-assemble the movement, but these cheap movement weren’t supposed to be repaired at all.

Baumgartner 866 CLD DIG: base plate

base plate

The balance, which is equipped with a large finger, beats slowly with 18000 A/h and is on both ends secured with a Novodiac shock protection system. On the dial side, there’s a oddity: Instead of using a ruby, a metal plate is used. This is only a few cents cheaper, than using a ruby bearing here, but if many thousands of these movements were sold, the price savings were a bit effective.

Baumgartner 866 CLD DIG: empty dial side

empty dial side

On the dial side, when the date ring is put away, you can see the yoke winding system and the two gears on top of the mainspring barrel, which drive the hour and minute wheels at the center of the movement.

Baumgartner 866 CLD DIG: dial side view with date mechanism

dial side view with date mechanism

The date indication mechanism is very simple: A star shaped wheel at 6:30 is driven by the hour wheel. It containts one longer tooth, which advances the date every 24 hours counterclockwise. The lever with a spring at 11 o’clock (the spring, which can fly very well, is not yet mounted) ensures proper locking of the date disc. There’s no quickset possibility for the date.

Baumgartner 866 CLD DIG: dial side view with hour display mechanism

dial side view with hour display mechanism

The same mechanism in a smaller implementation is used for the hour ring. The interlocked minute wheel drives a switching star at 3:30 o’clock, which also contains a longer tooth and advances the hour ring counterclockwise. There’s also a lever with spring to lock the ring. Of course, there’s no quickset possibility.

Baumgartner 866 CLD DIG: dial side without minute disc

dial side without minute disc

Here you can see how the dial side looks, when the minute disc is put away, and you can also see the recess for the spring of the minute ring lever.

Baumgartner 866 CLD DIG: Baumgartner 866 CLD DIG dial side

Baumgartner 866 CLD DIG dial side

The minute disc doesn’t jump but slides, just like a minute hand.

In the lab

The specimen shown here can with water damage (rust on the main plate and axels) in the lab and got a full service (cleaning, oiling and regulation). Due to the lack of tools, no further de-rusting of the gears was done.

Timegrapher result

Only in the position "dial up", the rates are perfect. Interestingly, this is the only position, where the only bearing ruby in the movement is effective. All other position show more or less poor rates, probably due to the water damages.
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+70 s/d
vertical positions
crown right (12 up)-400 s/d
crown up (3 up)-240 s/d
crown left (6 up)+120 s/d
crown down (9 up)-60 s/d
Timegrapher output

Technical data

Caliber:866 CLD DIG
Caliber base:Baumgartner 866
Size:13,5''' (measured: 30,7mmmm)
lift angle:44°
Number of jewels:1
Escapement:Pin lever
Balance types: Nickel anular balance
Shock protection(s): Novodiac
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Hairspring key
  • lever
  • escape wheel, seconds wheel, third wheel, center second pinion, mainspring barrel
Construction type:pillar construction
Winding mechanism:yoke winding system
Setting lever spring:1 hole(s)
  • SCI (indirect center seconds)
  • QG (date indication (aperture))
  • DIG (digital time indication)

Usage gallery

Baumgartner 866 CLD DIG: Sperina digital mens' watch

Sperina digital mens' watch