Sovereign Proof 1989 Tudor Rose

Marsh has it down as £1150, but I find the guide prices for modern sovereigns, even low mintage specials, to be a bit optimistic.

Ultimately, it depends how quickly you want to sell it.

£600 should sell fast enough.

I'd say a "fair price" would be somewhere £750-900 if you've still got the COA and original box/packaging... depending on how many others are listed on ebay and the like at the time. You might be waiting a while for a sale in that range but it would probably get there eventually.

If you're going the ebay route, I think they take around 10% so you need to factor that in. Selling to a dealer is something I'm not fond of as they make stupidly low offers in my opinion. Might be worth an email or two though, to ask them for a price just for reference.