A Schatz standard 400 day clock didn’t run well after repair. I had cleaned the movement and adjusted the fork on the suspension spring, yet the pendulum rotation was only about 3/4 of a turn with the mainspring fully wound. I installed a new mainspring, and the motion was slightly less. I polished the pivots, with very little improvement.

Finally, I replaced the suspension spring with a new Horolovar 0.004 inch spring (I hadn’t done so previously, because the old spring was flat with no kinks. It did have a slightly matte surface). The pendulum rotation increased to 4 1/4 turns when fully wound! (And almost as much with the mainspring wound only 2 turns.)

Here’s a list of the various things I did. Pendulum rotation is expressed in “balls”, where 4 balls is one turn.

12/10/10

Didn’t run well

12/13/10

Smooth and clean suspension fork

Escape arc: 1.8 balls; running arc 2.7 balls when wound 1.5 turns.

12/14/10

Fork was too low, raised it: rotation = 3 balls

12/24/10

Disassemble, clean, smooth broach pivot holes, polish anchor pin, oil T1 only. Escape arc: 2.1 balls; wound 1.5 turns: 2.8 balls rotation; wound fully: 3.2 balls; wound 2 turns: 3 balls.

12/30/10

Raise fork slightly (was mislocking a little). Escape arc: 2.3 balls; fully wound: 3.2 balls.

1/11/11

New mainspring installed. Lube T1 only(Castrol 5W30 synthetic motor oil). Wound 1.5 turns: now stops, new mainspring slightly less powerful than old one. Wound 2 turns: rotation 3.2 balls.

1/17/11

Polished the pivots. Wound 2 turns: 3.3 balls; fully wound: 3.5 balls. (very slight improvement)

Added Butterworth Nano-10 oil to T2 pivots: 2 turns: 3.3 balls; fully wound: 3.4 balls. (no improvement)

Tried moving anchor closer to escape wheel: made it worse, put it back to where it was.

1/18/11

Unwound 1 turn (from fully wound): there is slight mislocking. Unwound 1 more turn: still mislocks. Lowered the anchor slightly.

Replaced suspension spring (Horolovar 0.004 inch): Wound 2 turns: 4.8 balls rotation! Fully wound: 5.1 balls! Escape arc: 2.5 balls.

The old suspension spring appeared to be perfect. It had a matte finish (not shiny like the Horolovar springs). Replacing it with a Horolovar spring made the clock work properly.

Repair job 5341. The movement has no date. It was made around 1950 – 1952. Says Schatz on the dial. Earlier examples have no name on the dial. Horolovar plate no. 1278.

Related posts:

1. Setting Suspension Fork Height on Schatz and Kundo Standard 400 Day Clocks
2. Some Schatz London Coach 400 Day Clocks Need A 0.0024 Inch Suspension Spring
3. The Upper Suspension Block Must Fit the Saddle Correctly
4. 400 Day Clock Suspension Spring Sizes
5. Gear Rotation Speed in the Schatz Standard 400 Day Clock

This miniature 400 day clock is 8 1/4 inches tall without the dome. There in no name on the face. The back of the movement is labeled “Euramca”. The movement was made in Germany by Edgar Henn, and the “Horolovar 400 Day Clock Repair Guide” classifies this movement as plate 1088. It was made around 1953.

This clock uses suspension unit no. 29B, with a .0023 inch thick suspension spring. This clock ticks slower than the standard 400 day clocks, making only 7.5 beats per minute (8 beats in 64 seconds). Standard 400 day clocks by Kundo and Schatz make 8 beats per minute, and their miniature clocks make 10 beats per minute.

This video shows the remarkably large pendulum rotation on this clock, just over 1 1/2 turns when fully wound!

Repair job 5385.

Related posts:

1. Gear Rotation Speed in the Schatz Standard 400 Day Clock
2. Koma Midget 400 Day Clock
3. Heco Miniature 400 Day Clock (Made by Kern)
4. Kundo Miniature 400 Day Clock
5. Kern Miniature 400 Day Clock, Nickel Plated

This Seth Thomas Adamantine mantel clock is dated March 1901 on the case bottom (date code 1091C). The case is 12 1/8 inches tall, 17 5/8 inches wide at the feet, and the minute hand is 2 1/8 inches long from center to tip.

See more photos.

Adamantine is Seth Thomas’ patented process of applying colored celluloid to wood clock cases.

The movement has a recoil escapement located at the rear. (This is the first type of movement used in Adamantine clocks, and was phased out and replaced with the No. 89 movement around 1900 – 1901. March 1901 is the latest use of the rear-escapement movement that I have seen).

This clock has a metal dial with cutouts though which the numerals on a paper dial can be seen. The regulator is above the numeral “12″. (Clocks with No. 89 movement have the regulator below the center of the dial.)

This movement uses loop-end mainsprings that are 11/16 inches wide. This clock has the original mainsprings. The time spring is 0.018 inches thick, and the strike spring is 0.019 inches thick. If the springs needed  replacing, I would use 0.0165 inch thick springs. The original springs in this this clock were fine, so I cleaned and reinstalled them.

Here is a video of the escapement, and the clock striking:

Repair job 5369.

Related posts:

1. Seth Thomas Sparta Adamantine Mantel Clock
2. Seth Thomas Mahogany Adamantine Mantel Clock
3. Seth Thomas Mahogany Adamantine clock, 4830
4. Seth Thomas “Adamantine” Mantel Clock with “Ding Dong” Strike
5. Seth Thomas Adamantine Clock