Im only 10 mins down the road from Warwick and Warwick, I have a few items I intend on entering in to one of the auctions as soon as lockdown ends so will take this along and see what they think, ill update asap.
I decided to email Stanley Gibbons and ask for some clarification, I received a reply, SG D31wi is known mint, therefore a used copy showing watermark inverted should potentially exist but no certified used examples have come to market hence the blank price.
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