Seiko & Citizen Watch Forum Message Archive

I have a vintage diver's model 6309. I'm told that the

6309 is the best movement Seiko makes. My specific problem is that the watch is very slow, losing 4 - 20

minutes per day. I've had thye thing serviced by COSERV

N.J. several times and I'm just about at my wit's end with it. I really like this model and it has sentimental value for me. Is there any way that this movement can be adjusted or fixed? Who can do it? Thanks.