12 September 2019
27 November 2016
17 December 2012
It's difficult to offer an opinion without seeing the image.
I realise you might not want to share it publicly should it be a rare or unique image. You could share it with myself, Joe, and/or meanmistermustard via PM. I can guarantee none of us would share it publicly.
Your other option would be to contact an auction house that deal with this type of thing.
A couple of years ago we were asked for a similar opinion on a set of negatives of John which led the owner to take them to a valuation day at The Beatles Story in Liverpool.
Those proved to be unique, unseen, and valuable, making headlines around the world.
Obviously your image is unlikely to be on the same scale as a set of negatives, but it's impossible if it's important without someone knowledgeable or an auction expert taking a look.
That's the best opinion I can offer without knowing more, or having seen the image.
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"I only said we were bigger than Rod... and now there's all this!" Ron Nasty