BBGR French manufacturer of optical lenses - Nikon Optical Lenses
MINT] Nikon Nikkor-P.C 10.5cm f2.5 Rangefinder S Mount Lens EP Markings | eBay
What Do Those Numbers and Letters on Lenses Mean? | Learn Photography by Zoner Photo Studio
Sigma lens "D" designation on Nikon F lenses — anyone know what this means? These lenses have identical markings otherwise (I checked every resource I could find) : r/Nikon