Just to be clear: the foot for sale is definitely the NEW style that fits Activa, etc. (even if it doesn't entirely look like it - see below for why this is). And
@Gernella OK, I hope you enjoy it now that you know what it looks like!! I've ordered myself another from Frank Nutt that they promise will fit my 1008 for real.
@Sewbusy - thanks for the links, but it is a tad(!!) more complicated than that as I have discovered, not least as the "A" feet are not always labelled as such. I had long discussions about this particular foot with both the nice people at Frank Nutt and the people at Rona, a Bernina dealer in Waltham Cross. Handily it's in its original box, so they were able to look up the part number and tell me which machines it fits. It turns out it's quite unusual.
Broadly speaking there are three styles of Bernina feet, with the fittings changing to prevent you using the feet on an unsuitable machine. These are:
-- old old style with thick prongs (and often the number engraved on the foot) - these are the only feet that fit the really old (pre-1980s) models because these machines have a relatively narrow stitch width. Often seen on ebay.
-- newer old style with thin prongs and usually a stuck on white label - these fit more recent mechanical models like the 1008 and can also be used on the older mechanical models. These are the only "old" style feet you can buy new these days, rarer on ebay.
-- new style which have a notch at the back and a flat front panel, plus a yet wider stitch width. The C and D new style feet have an additional pad at the side of the fitting to take a computer sensor. The front plate means the new style feet will not physically go onto an older mechanical machine like the 830 or the 1008. The labels are generally red, but as you see in the picture, the "A" feet - the one in the middle - doesn't actually necessarily say A on the label.....
These pictures are from the Bernina website shows them all, with from left to right: Old old, newer old, new, C, and D
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However, it seems that briefly, c.1996 when they first brought out the new style feet, the new style feet did not have the plate at the front, just the notch at the back, and the labels were still white. That's what this foot is - new style but with a white label and without the front plate.
That would have been ok except that they also changed the angle of the shank at the same time so that the actual foot bit of the new style feet projects much further forward than the older styles, meaning that if you put it on a 1008 or similar, the needle comes down on solid metal not into a hole. You can see this very clearly in the photos below, which are the newer old style number 1 foot from my 1008 and the 10 foot I'm selling. And also why its confusing - the fitting and label are basically the same, the foot itself is decidedly not.
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I cannot have been the only person c.1996 who picked up a new foot and assumed it would work on my older machine, only to discover - as broken needle parts flew everywhere - that it didn't! I'm also sure that they added the plate to the new style feet as much to prevent you putting the new feet on older machines as to accommodate the needle threader, which is the usual reason given for the change.
Anyway, long story! There seemingly weren't many made like this because of the problems with people accidentally putting them on the wrong machines, but it definitely is a new style foot for Activa, etc. I'm now thinking of putting it on ebay with a higher price as a collector's item, but will leave it here in case anyone wants it to actually sew with.