Proper Catalogue Value For A # 505 Error Block Of 9

I just bought the above block. Facts: error is NH, 2 in the middle row are H, the rest all NH.

NH single 625.00

NH block 950.00

H single 325.00

H block 625.00

So there is a $ 300.00 premium for the block. I guess I can't say the CV as a NH block is...
What I decided to do in a listing is just a CV of $ 625++ and explain about the block premium etc.
Any comments are appreciated.
Norman Hinds

Maybe I don't understand your question but here's my attempt at answering. If a block is hinged anywhere the cv is $625. It doesn't matter if the error stamp is NH, the cv is $625. The MNH cv of $950 is for a block that is not hinged anywhere. So, your hinged block has a straightforward cv of $625. No explanations needed.