I think I've a duplicate one like the one Nimit's said. Purchased it a while back for the W810i. It should be in working condition I guess. Must be somewhere in the closet. Send me the shipping charges and I'll send it over. But before that, I'll have to check if it's working.
When I asked for it in the local shop, I was given one and when asked about the cost he said nil. Asked why, he told the headset was DOA. Of course it is not original. Anyone from Kollam can have it from me.