Super-Multi-Coated TAKUMAR / 6x7  1: 4 / 400 
Produced 1971 to 1986. Serial Numbers 4791xxx - 8510xxx. AOCo Product No.(none).  Updated March 2024.

(Research Note: Since 2015 I have seen 3.89% (144 copies) of the total estimated 3,700 copies made.)

LENS PRODUCTION  (∑ lenses)  ∑n = 144 Serial Numbers observed in 40 Batches covering 1,466 SN min. < ∑ lenses < 5,938 SN max.
SN min. = accumulated total of serial numbers observed within 40 batches
SN max. = accumulated total of serial numbers observed between adjacent batches of other lenses.

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4791504 to 4791505 (2/ 2)
5700598 to 5700637 (5/ 39)
6932161 (1/ 1)
7557567 to 7557567 (2/ 17)
7579232 (1/ 1)
7582388 to 7582417 (3/ 29)
7583937 to 7584025 (8/ 88)
7584803 to 7584825 (3/ 22)
7586271 to 7586286 (4/ 15)
7587696 (1/ 1)
7598201 to 7598243 (5/ 42)
8209088 (1/ 1)
8210738 to 8210759 (3/ 21)

 Serial Numbers in 40 Batches 
(n /SN range)
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8211109 to 8211135 (5/ 26)
8219820 (1/ 1)
8220559 to 8220602 (4/ 43)
8223552 to 8223579 (3/ 27)
8227665 to 8227681 (2/ 16)
8236252 to 8236285 (5/ 33)
8241617 (1/ 1)
8242120 to 8242135 (3/ 11)
8246823 to 8246864 (4/ 41)
8249082 to 8249153 (5/ 61)
8256998 to 8257119 (13/ 121)
8272845 to 8272851 (2/ 6)
8276938 to 8277157 (8/ 219)
8293351 to 8293396 (6/45)

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8296264 to 8296291 (2/ 27)
8299172 to 8299491 (15/ 319)
8428957 (1/ 1)
8468548 to 8468623 (9/ 75)
8470413 to 8470457 (2/ 44)
8473912 (1/ 1)
8475377 (1/ 1)
8479810 (1/ 1)
8493524 to 8493533 (3/ 9)
8499962 to 8499990 (3/ 28)
8502052 to 8502059 (2/7)
8508923 (1/ 1)
8510029 to 8510051 (2/ 22)