Incabloc spring for HPP 431

[EastCoastChuck]

I’ve found very limited information on this a German movement from the 1960s and need to figure out the right size shock spring for the bottom jewel. Or even a best guess from someone with more experience on a size that might work. 

The most I’ve found on the movement is here https://17jewels.info/movements/h/hpp/hpp-431/

Thanks in advance.

 

[WatchMaker]

HPP is Henzi & Pfaff who traded a lot of watches under the Hercules brand (not sure what you have on your dial).

There's some history on this brand here ... https://watch-wiki.org/index.php?title=Henzi_%26_Pfaff_GmbH. It's in German but you can let your browser's translation function take the strain. 

You can find tech sheets for Incabloc in various places. Here's one such place where you'll note the 'HP,HPP' page: https://drive.google.com/drive/folders/0B279zYzmTSk3STNIeFR1MGd1NXc. Rather frustratingly this doesn't have your 431 listed however. 

If it helps any in other searching around though I believe your base model is an HPP 420 which would then include 421 to 425 in this family.

Let's see what other folk come up with but it might be just as well you buy an Incabloc assortment relatively inexpensively e.g. https://www.ebay.com/itm/193654055275

[grsnovi]

This is site is a great resource for info on specific movements.

This link goes to the HPP 431.

[EastCoastChuck]

1 hour ago, WatchMaker said:

HPP is Henzi & Pfaff who traded a lot of watches under the Hercules brand (not sure what you have on your dial).

It’s not easy to read in this picture since I haven’t cleaned the dial yet, but it reads ORFA, Automatic, Incabloc, 25 jewels

[grsnovi]

Here is the relevant page from Bestfit #111 - I don't know how to correlate this with what you might see at Cousins (or wherever you might go to purchase). 

This page also has some additional information.

Edited June 10, 2022 by grsnovi

[EastCoastChuck]

1 hour ago, grsnovi said:

Here is the relevant page from Bestfit #111

Greatly appreciated!