Nippon Kogaku Tokyo Nikkor-S-C 1.4/5cm all-black

early all black version, much earlier then all 4 other batches of this extremely rare lens, engraving matching the one variation of the "5005xxx" engraving style; see Rotoloni p. 248, only about 700 to 800 all black lenses have been made, this one seems to be unique; no other all black lens is known to us with such low production number, in near mint condition, original black metal front cap with logo in white