classic version + SN located on lens barrel (e.g.classic version: black + colored lettering (e.g.redesigned version - similar look to 44-3 (e.g.black + white lettering, sn "xxx" (e.g.1974, rebadged/export models may have sn "0xxx") MMZ zebra lenses with serial number beginning by "N90xxx" or "N00xxx" are likely made in 19 (first number of sn very likely means year of 196x decade) serial numbers often corresponds to year of manufacture (with the exception of 0xxx / 00xxx numbers and "N" marked MMZ lenses) manufactured from 1971 in KMZ and MMZ, in 1974 production moved to JOV, in 1982/83 production moved to MMZ black + white lettering, M42, "2/58", sn "N0xxx", 8 blades.black + white lettering, "2/58", sn "N0xxx", 8 blades. MMZ lenses with serial number beginning by "N40xxx", "N50xxx" or "N60xxx" are likely made in 1964, 19 (first number of sn very likely means year of 196x decade) serial number almost never corresponds to year of manufacture, nearly always begins by "N" or "N°" there is a KMZ prototype marked "Helios 44-1", but production models are always marked only as "44" M39 SLR, sometimes appears as M42 model (possibly early version of 44-2 with old model ring) Last edited by no-X on Tue 3:32 pm edited 5 times in total 24 x 36 (rangefinder FED, Leica M mount) 18 x 24 (half-frame rangefinder FED mikron) double-gauss, lanthanum glass, 12-21 (?) models: 44, 44M, 44K and many others, see next post enhanced double-gauss (negative doublet as front element), 212-21 0 Most of them were designed for motion-picture cameras and offered very high speed.
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