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Thanks Red Vert. Any idea about the white part of the back-up lens? It has a number on it too.
My BU light has 69 on the red part and 70 on the white part...
Thanks,
Sum
Sounds like you have 70 reverse lens. Not sure if they are originals or repops. I don't think there was anything but guidex on the red part. I'm not that up on 70-72's so I'm going from memory.