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I don't know the answer to your question but I had a quick browse of other Hodson models on the forum and he does seem to have had various reasons for the model letters. His SR model is a Santos Rosewood, his DR is (I guess) named after David Reinhardt, who he built the model for, his A model is for his entry level range (I guess with A as the first letter of the alphabet) etc. So maybe there's something distinctive about the model that gave it these initials. From the photos, the thing that stands out is those pearl-like inlays so I wonder if it is something to do with that.
Thank you so much for your answer.
I feel quite sure you're on the right lines with regard to the 'GN' and the guitar's appearance.
Some photos of the purfling and the back of the instrument.
Did he have any relatives or leave behind a "build book" or register that might have held some clues?