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Thanks for the photos. I can see the whole fusee cone and it can be taken apart. I also see your p/w has maintaining power. That means when you wind the p/w power stays in the movement at the same force. On a movement with no maintaining power when you go to wind it up power is taken off for split seconds there for the movement will fail fractions of a second.

If it helps, my grandfather dropped a few on Dresden to even up the scores [emoji6] Sent from my iPhone using Tapatalk

Checked this? https://blog.noq2.net/benrus-electronic-citation.html Try contact paul on electric-watches.co.uk . He could help you with a service i think. The movement aren't supertricky to work on. But need to take care when put the spring in around the escape wheel and center wheel.

Looking at the video, to me it looks like the balance is stiff and might not have enough end shake. Check all the jewels making sure there is no old oil still there. Check, all the pivots on the escapement for rough spots, they need to be spotless and burnished. Make sure the pallet stones are correct and not lose and clean. The roller pin needs to be smooth and not have rough edges and secure in the roller. Does the pallet fork look right? If you have removed and jewels make sure you have put them back right.

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Seiko you can find the right crystal by using the reference number on the caseback. And then look at jules borel or boley.de. . Maybe even for the citizens you gcan find info there. this is just an example. http://cgi.julesborel.com/ http://cgi.julesborel.com/cgi-bin/matcgi2?ref=SEK+CS%237A38-7020&submit=Search http://cgi.julesborel.com/cgi-bin/matcgi2?ref=W]Zl]FjcTI