R.E.L. Binoculars

[lawrence_n]

Good day all! I have a shot at a pair of R.E.L. WWII binoculars with the case in overall very good condition (considering). Though I haven't had a chance to actually handle them, the lenses look OK. On an odd note, there is a secondary set of dials beside each eye piece with the letters "D G Y O". From my research, I'm given to understand that these are adjustable filters. I have 2 questions. Firstly, any idea of fair market value? Secondly, any idea what the letters designate? Any help would be most appreciated.

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