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If the buyer and seller mutually agree that's the price of the transaction, then it's fair. Whether that means it's also 'realistic' or 'normal' or 'what you could expect to pay', is a whole different matter.

Yes, I do like it! It just took a while for the penny to drop, and for me to calculate that one hammered Spink ref can cover 50+ varieties of one coin and numerous mint marks, common and rare alike!Rare mint mark of same S number sells £500 Common mint mark of same S number sells £140 Ref guide so far = £320 Simples! Edit: moral of the story is don't expect to get £320 for your common mint mark, just because the Spink's guide values it 'group' as such! That doesn't sound right, Stuart. Surely a rarity weighting needs to be included in the algorithm? Here's a puzzle for the weekend: If there are two varieties of a coin and the rarer, worth £100, appears 1/10 of the time, while the more common, worth £10, appears 9/10 of the time, show that the weighted average value is £19. :-) Shouldn't this be the Spink value?