Movement does not look especially dirty, but there are some fibres here and there.

Dial and hands before I remove them.

I notice there is a little more dirt on the dial side.

I now start taking apart the gear train. 

Here you can see some of the gear train exposed.

I will take out the mainspring and clean it.

Movement cleaned and ready to be put back together.

Mainspring is oiled and put back into the barrel.

I see that the balance moves freely after fitting the shock jewels.

The ratchet wheel is placed on the underside of the barrel bridge.

I fit the barrel and barrel bridge.

I now fit the setting/winding mechanism.

The gear train goes back into the movement.

I’m happy to have a ticking movement again! I must say it does look very nice.

That’s good enough for an old Patek;)

Ready for dial and hands.

Dial and hands back in place

Movement goes back into the case.