1883 Gothic Florin

I was going through my grandfather's collection to determine values for insurance purposes and came across a handful of foreign coins. I don't have any resources on grading non-U.S. coins, so I would appreciate any grading/valuing thoughts on this gothic florin.

From all that yellow on the obverse, I think at some time this one might have been glued to something (although there also appears to be some on the reverse as well). Would I be safe in guessing that by this point all the damage is done? I would hate for this coin to degrade further from inaction.

Thanks!