Looks like a 0.6 with sub zero 2n arms . May have been substituted to replace a piece that broke since the bronze was only in those two frames. I managed to safely put sub zero #2 fingerprint arms on a sub zero #6 planet x lens. Only way I could salvage something from both. Ear stem got busted on the planet x when they got dropped and stepped on and the #2 cracked right down the nose piece, that was my second pair of Oakley ever bought brand new in '92