SMC PENTAX 67 1:4  45mm
Produced 1980's. Serial Numbers 8575xxx - 8621xxx. AOCo Product No.(none).  Updated April 2024.

(Research Note: Since 2015 I have seen 1.50% (259 copies) of the total estimated 17,200 copies made.)

LENS PRODUCTION  (∑ lenses)  ∑n = 259 Serial Numbers observed in 65 Batches covering 10,892 SN min. < ∑ lenses < 23,609 SN max.
SN min. = accumulated total of serial numbers observed within 65 batches
SN max. = accumulated total of serial numbers observed between adjacent batches of other lenses.

8575254 to 8575479 (8/ 225)
8575541 to 8575904 (8/ 364)
8576956 (1/ 1)
8577537 to 8577658 (2/ 121)
8578541 to 8578721 (6/ 180)
8579430 to 8579638 (5/ 208)
8580621 to 8580857 (3/ 236)
8581419 to 8581528 (3/ 109)
8582141 to 8582378 (6/ 237)
8582911 to 8583196 (3/ 285)
8584651 to 8585729 (13/ 1078)
8588176 to 8588392 (4/ 216)
8588664 to 8588938 (4/ 274)
8590235 to 8590447 (3/ 212)
8590975 to 8591264 (6/ 289)
8591688 to 8591978 (10/ 290)
8592589 to 8592909 (8/ 320)
8593118 to 8593417 (6/ 299)
8594457 to 8594728 (4/ 271)
8596301 to 8596509 (7/ 208)
8597159 to 8597348 (5/ 189)

 Serial Numbers in 65 Batches 
(n /SN range)

8597718 to 8597843 (3/ 125)
8598606 to 8599010 (4/ 404)
8599691 to 8600261 (10/ 570)*
8600472 to 8600981 (10/ 509)
8601930 to 8601959 (2/ 29)
8602523 to 8602606 (3/ 83)
8603133 to 8603355 (5/ 222)
8604038 to 8604114 (4/ 76)
8604668 to 8604921 (7/ 253)
8605409 to 8605507 (3/ 98)
8605725 to 8605732 (2/ 7)
8606178 to 8606294 (3/ 116)
8607116 to 8607470 (11/ 354)
8608033 to 8608302 (3/ 269)
8608667 to 8608706 (2/ 39)
8609306 (1/ 1)
8609731 to 8609777 (3/ 46)
8610485 to 8610758 (6/ 273)
8610967 to 8610969 (2/ 2)
8611253 to 8611308 (2/ 55)
8611631 to 8611701 (4/ 70)
8611895 to 8611912 (2/ 17)

​
8612092 to 8612198 (2/ 106)
8612337 to 8612430 (3/ 93)
8612699 to 8612764 (2/ 65)
8613025 (1/ 1)
8613472 to 8613520 (4/ 48)
8613867 to 8613963 (4/ 96)
8614387 (1/ 1)
8614487 to 8614844 (3/ 357)
8614982 to 8615049 (2/ 67)
8615556 to 8615581 (2/ 25)
8615718 to 8615806 (3/ 88)
8616002 (1/ 1)
8616256 to 8616337 (3/ 81)
8616661 to 8616996 (8/ 335)
8617529 to 8617684 (3/ 155)
8617725 (1/ 1)
8617958 to 8618019 (2/ 61)
8618371 to 8618373 (2/ 2)
8619127 (1/ 1)
8619621 (1/ 1)
8620311 (1/ 1)
8621009 to 8621085 (2/ 76)