Used Genuine SCHNEIDER OPTIK KREUZNACH Front Lens Cap SN 223-045.5 x 02.3 01 2103030
Not sure what lens it will fit. Outer diameter is 48.8mm. Inner is 45.7mm. I have tested it on 49mm filter rim and it is too large. You could force it in, but it seems to be little bit too large for 49mm. It is too small on 52mm. So not sure what lens it will fit.
Item has been used with signs of cosmetic use - it may have some scratching from normal use. But it is not damaged in any way, no cracks (see pics). This lens cap is fully operational and functions as intended. I would rate it an 8, on a scale from 1 to 10.