I'm almost sure by the hand that it's some type of Fairyland production, but which 60-ish cm line it would belong to is a mystery (I shopped feverishly over 12 years ago and did keep a record file, but the death of a computer hard drive destroyed that.) I don't know if it came with a particular doll as a theme special arm, or if it was some kind of event item. Or if it's a different company all together. Apologies for the large pix. Our auto-resizer appears to be getting more lax these days --
I found this ancient WTB thread that is the same arm you have: it's a Feeple60 2010 summer event arm!
@overlordu - I don't know which is more impressive, that you found a WTB record that included photos - or found an old one where the pictures are still active! Thanks so much!