SMC PENTAX  67  1:4  300mm
Produced 1987-2000 Serial Numbers 8507xxx - 8619xxx. AOCo Product No.xxx.  Updated May 2024.

(Research Note: Since 2015 I have seen 1.75% (238 copies) of the total estimated 13,600 copies made.)

LENS PRODUCTION  (∑ lenses)  ∑n = 238 Serial Numbers observed in 45 Batches covering 9,127 SN min. < ∑ lenses < 18,117 SN max.
SN min. = accumulated total of serial numbers observed within 45 batches
SN max. = accumulated total of serial numbers observed between adjacent batches of other lenses.

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8507712 to 8508383 (15/ 671)
8508994 to 8509304 (11/ 310)
8573578 to 8573717 (3/ 139)
8574812 to 8575081 (4/ 269)
8577142 to 8577422 (3/ 280)
8577682 to 8578083 (9/ 401)
8580031 to 8580315 (7/ 284)
8581119 to 8581128 (2/ 9)
8581702 to 8581731 (4/ 29)
8583248 to 8584550 (31/ 1302)
8587329 to 8588044 (8/ 715)
8589508 to 8589922 (5/ 414)
8592054 (1/ 1)
8592085 to 8592293 (9/ 208)
8592986 to 8593034 (4/ 48)

 Serial Numbers in 45 Batches 
(n /SN range)

8593631 to 8594105 (10/ 474)
8594798 to 8595031 (3/ 233)
8596740 to 8596987 (8/ 247)
8597438 to 8597682 (6/ 244)
8598108 to 8598282 (5/ 174)
8599241 to 8599553 (8/ 312)
8601510 to 8601861 (9/ 351)
8602181 to 8602366 (5/ 185)
8602724 to 8602949 (6/ 225)
8603823 to 8603887 (3/ 64)
8604309 to 8604618 (9/ 309)
8605004 to 8605172 (7/ 168)
8605829 to 8606096 (4/ 267)
8606940 (1/ 1)
8607637 to 8607784 (3/ 147)

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8608005 (1/ 1)
8608381 to 8608460 (3/ 79)
8608974 to 8609106 (4/ 132)
8609893 (1/ 1)
8610846 to 8610916 (3/ 70)
8611545 to 8611623 (4/ 78)
8612029 to 8612068 (3/ 39)
8612279 to 8612319 (3/ 40)
8612629 (1/ 1)
8613066 (1/ 1)
8613583 to 8613619 (4/ 36)
8614043 to 8614141 (2/ 98)
8614892 to 8614913 (3/ 21)
8617761 to 8617810 (3/ 48)
8619426 (1/ 1)