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New purchase from the watch and clock fair Birmingham.

Depends on your experience if you haven't replaced a b/s before you might think of obtaining a balance complete.

Good useful info Marc. The only way to be really sure is measure the old balance & see if the same measurements apply to the 6600/430.

I would certainly say that it was part of the same family of movements as the 6664 but there are a number of differences. The 6664 has a push pin stem release and an adjustable stud carrier. The OP's watch has a screw stem release, a fixed stud carrier, and a completely different set lever bridge/spring. It also has a cut away around the outer edge of the train wheel bridge, although this may simply be cosmetic. I'm not saying that it definitely isn't a 6664 as it is not uncommon for there to be slight variations within a particular calibre, however, this level of deviation is usually accompanied by a change in designation. Of course it may make no difference at all in this case as it could well be that the same balance staff is used across the whole movement family, but then again if there are variations in (for instance) beat rate within the movement family, this may also mean variations in balance design and potentially different staffs. It goes without saying that whatever it turns out to be it needs a non-shock protected staff and not the Incabloc illustrated on Ranfft.

I think it is a FEF 6664. I say think because these style of movements look very similar to each other. To be certain you need to take measurements of the movement & also take what measurement if you can of the old balance staff. http://www.ranfft.de/cgi-bin/bidfun-db.cgi?00&ranfft&a&2uswk&FEF_6664 to do your own research use this http://www.ranfft.de/cgi-bin/bidfun-2uswk.cgi?1&ranfft

A mov.t like the above is $4 or so. I buy complete watches to make small gifts, for less than $10. I'll take them apart and post pictures when I have a chance.

Er yes, whoops, that's exactly what I meant.

I have one too I bought online for about $20USD. What do you mean it's fake? Lol.

Cleaned and doubled the Amplitude https://vimeo.com/198617911 BEFORE https://vimeo.com/198617967 AFTER Sent from my iPhone using Tapatalk Pro