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Hi Martin & welcome to IIS.
A mark that small shouldn't affect your views... I've seen a few mirrors which were in pretty poor condition, yet their owners dragged them out night after night without complaint. I'd query it with the owner to see exactly what it is, but if it's nothing more than water (and if it can be removed, not sure about that model), you could wash the mirror. I've no idea how it's done, but there are guides all over here and the net. I can't help you with the price query, hopefully another 8" LX90 owner will see this thread.
At a guess I'd say the "specks" on the mirror when you shine the torch are more than likely particles of dust.
Cheers
Wade
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