Pierpont Watch Co Incabloc Restore – Wunderlich Family Info

The AS 1187/94 is a vintage Swiss mechanical watch movement made by A. Schild SA, featuring manual winding and a sweep second hand. Introduced in the 1940s, it served as a reliable workhorse ébauche utilized across numerous mid-century watch brands, including periodic use by Tudor. [ 1 , 2, 3 , 4 ]

**Technical Overview **

Type: Mechanical manual-wind
Diameter: Approximately 25.8 mm to 28.5 mm (depending on casing and rings)
Family: Part of the A. Schild 1187/1194 group (sharing architecture with calibers like 1158 and 1190)
Function: Sweep second design, highly modular with interchangeable wheels and bridges [ 1 , 2, 3 ]

**Repair and Restoration Notes **

Common Issue: On Watch Repair Talk, experts note a consensus that the balance wheel may bind or lose free play if an incorrect replacement balance staff or mismatched shock-resistor system is installed.
Servicing: Because these are vintage mid-century movements, they are popular for restoration practice, though dried lubricants often require a full ultrasonic cleaning and teardown. [ 3 ]

If you are working on an AS 1187/94, let me know:Are you trying to fix a specific issue (like a stuck balance or broken mainspring)?Do you need help finding replacement parts?

AI responses may include mistakes.

[1] https://www.emmywatch.com/db/movement/a_schild–1187/

[2] https://calibercorner.com/a-schild-caliber-as-1194/

[3] https://omegaforums.net/threads/movement-id-as-1187-or-1194-in-vintage-1940s-watch.189595/

[4] https://www.watchmaterial.com/as-a-schild-1187-main-spring-replacement/

[5] https://www.watchrepairtalk.com/topic/19050-movement-as-118794/

I ordered a mainspring. I have not made very good notes on this one.

I have no idea why or how I settled on that spring I ordered.

I ordered a 711k spring?

Key spec numbers if you’re servicing it: stem W1131, balance staff U2438, mainspring 1.60 × 9.0 × 0.10 × 290mm (one source lists 1.60 × 8.0 × 0.10 × 260mm). Lift angle is listed as 52° but that figure is flagged as needing confirmation, so treat timing-machine amplitude readings with a grain of salt until you verify it. Ranfft Caliber Corner

On the spring: 711K is a Bestfit/material-house number, not a GR number. It cross-references as MS-711K, 1.60 × 0.10 × 300, 9mm barrel, equivalent to GR 4486. Meanwhile Générale Ressorts’ own spec for the AS 1194 is GR4502 at 1.60 × 0.105 × 280 × 8.5. So your 711K is a hair thinner and 20mm longer than GR’s recommendation — a reasonable substitute, but not identical.

I thought this jewel might be cracked but it was just dirty I think I swobbed it with my cleaning swab and I think that was like your crack came right off.

so here's what I'm observing on first look is that the watch will the balance spins but the the center wheel should advance it just kind of goes back and forth I don't think there's any power on this whatsoever my theory is that the spring is broken you can wind it and wind it and wind it and no power really comes on to it otherwise it looks like it's in pretty good shape there's no obvious breaks to any of the jewels all the screws look like they're in pretty good condition the stem release screw it looks like it's definitely been worked on in access before it's kind of scratched up a little bit so I have a suspicion that the stem and crown potentially were replaced or worked on at some point it's nothing wrong with only that I can tell but I'm not going to take this much more part until after I'm back from my trip swapping the surface does show that there's just some basic surface grind build up on the watch nothing too outrageous or unexpected but in that I don't see any signs of water intrusion into the watch that pretty good hope so this one

So there's actually two screws missing potentially. I can't mark them up in the microscope due because the picture picture covers up the annotation area but whatever. I'll fix that in software. I just want to make a note. I've taken out this ring and the only thing holding in is the ring. So it can shift around a lot without those screws in. Don't know why they're missing or if they're supposed to be there.

I ended up using the yellow screwdriver to manipulate the stem screw to try and get the stem out.

That did allow me to extract the stone which is pretty gross, but now it's out. You can see a lot of really black, a little grease there.

Super nice dial, I like it a lot. I wish I had a better tool to check the loom to see if it was ready or not. I'm not going to mess with it too much right now, because it's a good shape but it does have a little bit of evidence that there's some freedom burning going on.

I remove the cannon pin, you can see the microscope view here and I put that in tray position 2.

Microscope Audio Note 2026-08-13 17:34:23 — The top of the screen is a regular screen, the bottom screen is a reverse-studied screen, it goes in the bottom, wider.

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