I do not know. I do not have the Mark1, but I think it is just the display board that is different - the actual VFD glass should be the same. Rod read off the Noritake part number of PaulWay's Mark1 in his posts, and it matched my previous posts for the last bulk order for the Mark2. I am guessing that it will work.
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Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs