The browny coloured lettering ones were the first models and were released prior to Skywatcher adopting the anodised green trim and new graphic style. Other than appearance they are the same scope (I've owned a 100mm, 120mm and 80mm at various times.) The 100mm was the browny color and was the best of them optically. I was a total idiot for selling it.
FWIW
Gary
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