Jump to content

Screws on Cyma 56 with a twist


Recommended Posts

I bought a really fun Cyma Synchron watch and had it shipped from Israel.  The gold plated case is pretty large and thick to be an early 1970s watch.  It needed a new mainspring which the best i could find was from Cousins.  Im on the southwest side of the USA. Did anyone know Cousins makes one do a bank wire transfer if the international order is over 1000 pounds??

Anyway.... so i decided to put the watch back together as a trial run after i washed it.  So i could free up the dust cover tray and not lose parts.  No lube.  No mainspring.  Just so i could assess faults and get a feel for the way it goes together, as well.

I believe this Cyma watch has an ETA 2770 movement but i cannot confirm positively.  Its some type of early 70's ETA.

So everything was just falling into place on reassembly but i got very frustrated with the screw lengths.  I'd say 99% of the screws in this watch are the same thread and same OD with countersunk head profiles, however they are 2 different lengths, and a few have polished heads but most dont.

It seems to me that simplicity is an art in and of itself.  Why didnt the technical designers make all the screws of the main size the same length to save time and frustration?

I thought surely the longer screws were for the bridges but they arent.  Those screws are too long because the length interferes with the date wheel on the dial side.

So heres the really wacky part.  I found a cap jewel apon disassembly that was laying in the movement.  Its not one of the balance jewels,  both are present in their respective incablocs  So a previous workman left one in the movement by accident.  I have this vision of a cap jewel pinging off a workperson's tweezers and he/she looked and looked.  Probably had to order a new one if they didnt have it in house.  And all this time it pinged over to this Cyma and was hidden in the case for years.  These little parts have a life of their own.  

Link to comment
Share on other sites

Thank you watchweasol.  Where did you find that spec sheet?  Wow great information and it specifys where all the screws are designed to go.  Lovely!  And yes it appears to be an ETA 2770 mainspring barrel specs are the same 11mm inside diameter with a 2mm diameter mainspring arbor.  Here is a pic. 

20200725_140137.jpg

  • Like 1
Link to comment
Share on other sites



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • people be honest.... Swatch is evil for the watchmakers and repairers, BUT not everything in watches from Switzerland is from the Swatch-Group. As far as i know, Selitta got sacked by Swatch as a Movement-Assembler for them and they started to produce Movements in their own Name with slight Modifications. As far as i know, they sell Parts to the Market for their Movements. In most cases, if a ETA-Movement fails, it is a valid Option to replace it with a Selitta Movement, which i consider the Solution for this Mess with the Swatch-Group...... I have no Connection to anybody at Selitta, but being a Swiss-Guy, i still like to have Swiss-Made Watches, but not from the Swatch-Group.   ok ? regards, Ernst
    • Just one more greedy act by Swatch. They started a number of years ago here in the US..cutting off supplies to watchmakers that could build complications that many Swatch houses couldn't even touch. Old school masters who had gone through some of the most prestigious houses in the world. Otto Frei has some statements on their page about it. I tell all my customers to avoid new Swiss watches like the plague,..unless they just want an older one in their collection that still has some parts out on the market, or they have really deep pockets and don't mind waiting months and paying through the nose to get it back. Plenty of others to choose from..IE Seiko,..or other non-swiss brands Even a number of Chinese brands are catching up with the Swiss,..and I think that in time, their actions will be their downfall
    • Yes. If that's not what you are experiencing...start looking for something rubbing. A 1st guess is that one of the hands is rubbing against the hole in the center of the dial. Especially if you now have lower amplitude in face up/ face down positions.
    • Once a movement has the dial and hands put back and it is recased, would you expect the assembled watch to have the same amplitude as when the movement is in a movement holder and is without hands and dial? Thanks
    • C07641+ not sure what the "+" is for after the last digit.
×
×
  • Create New...