Service: Omega 300 calibre 565


A client has sent in his lovely Omega 300 case ref: 166024 – 67 SC It’s in need of a service. 


Movement looks to be in decent condition.


Watch is running, but loosing a lot of time.


Here you can see the inside of the autowinder mechanism.


The screw head for the rotor Gib broke, but luckily I managed to wiggle out the screw.


Here you can see the date changing mechanism for the 565.


Here you can see the setting/winding mechanism. You can also see the long thin post from the second hand pinion protruding though the centre wheel.


Here you can see the gear train layout of the 550 series with the bridge removed.


Old mainspring.


All the parts cleaned and ready to be put back together.


New mainspring in the cleaned barrel.


Here I see that the balance moves freely after fitting the cap jewels.


Gear train back together.


Base movement almost back together.


Base movement back together and ticking. I like the micro regulator you find on these Omega movements.


Watch is performing very well.


Dial and hands goes back on the movement.

Omega Seamaster 300 movement

Movement back in the case looking good!

Omega Seamaster 300

Nice looking classic.

3 Responses to Service: Omega 300 calibre 565

  1. Brandon says:

    Do you have any tricks for installing new mainsprings, particularly the new ones that come wound in a sleeve or washer? What I have done for years is, while holding the sleeve I use a screwdriver and slowly press along the outside of the mainspring pushing it into the barrel. I feel like there is a better way, but anything else I have tried, has resulted in a mainspring that doesn’t completely go into a barrel, with an outer coil sticking out. Any advice is greatly appreciated!


    • mitka88 says:

      Hi Brandon,

      I find no flaw in your technique:)

      I find that the sleeve for the 550 series is never small enough for the barrel, causing the outer wind not going into the barrel (like you mentioned) So I unwind the mainspring out of the sleeve and then wind the mainspring manually into the barrel. I use powder free nitride gloves when handling the mainspring. When the sleeve is small enough for the mainspring to be pushed straight into the barrel I press it in with a plastic stick. One can also use mainspring winders, but I never quite took to them.

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