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What is a INCABLOC?

I take it is a movement. Can anyone explain it to me? Thanks!
Answer:
Incabloc is a patented system involving the balance jewels, the balance staff, the roller, and, most noticably, a special spring that holds the cap jewel in place. The goal is to improve shock resistance of the watch by spring-mounting the cap jewels. When the watch receives a shock, the Incabloc spring allows the cap jewel to move a bit, and the design of the rest of the parts allows the impact to be largely absorbed by the shoulder of the balance staff or the edge of the roller - rather than by the delicate balance pivots.
While there were certainly shock protection systems in place before Incabloc (which was introduced around 1934), this seems to have been the first really effective one (or maybe it just had the best marketing of its time?). It's still in use today and is standard equipment on most mechanical movements. The other main shock protection systems are Kif and Seiko's in-house system.
Elgin rarely used this type of shock protection (or ANY shock protection, for that matter). It was employed on the outsourced A. Schild et al movements they used, but the only in-house Elgins I know that had it were their Korean war era military wristwatches.
Answer:
...shock-protection units on the balance assemblies.
Tissot cal. 27B
Buren cal. 1010
Valjoux cal. 92
Lanco cal. 6148
And for comparison, here is an Eta cal. 735 with no shock protection.
(Movements from the collection of Rob B).
Paul.
Answer:
Here's a picture of incabloc component parts.
Best Regards,
Eric
Watchout www.watchgeek.com/incabloc_parts.htm

1945 Omega 30T2 SC