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Produced 1967 to 1971. Serial Numbers 2241xxx - 4423xxx. AOCo Product No. 43961. Honeywell Pentax Cat.No.7087. Updated June 2026

(Research Note: Since 2010 I have seen 3.13% (885 copies) of the total estimated 28,300 copies made.)

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INTRODUCTION

DESCRIPTION

VARIATION

NOTES

LENS PRODUCTION  (∑ lenses)  ∑n =885 Serial Numbers observed in 21 Batches covering 26,124 SN min. < ∑ lenses < 30,448 SN max.
SN min. = accumulated total of serial numbers observed within 21 batches
SN max. = accumulated total of serial numbers observed between adjacent batches of other lenses.
Two Styles: Focus ring; ▼ F(10/12) 10 grooves in 12 finger grips ▲ / ▼ ▼ F(9/12) 9 grooves in 12 finger grips ▲▲. 
Otherwise: Aperture ring; A(10/11) ; Oval lettering on nameplate all lower case and " Asahi Opt. Co." lacking comma.

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2241344 to 2241467 (7/ 123)
2242456 to 2243092 (31/ 616) 
2244159 to 2247480 (138/ 3321) 
2249111 (1/ 1)
2973675 to 2975534 (66/ 1859)
2975719 to 2977483 (45/ 1764) 
2978018 to 2979153 (46/ 1135)
▲

Serial Numbers in 21 Batches (n /SN range)
Collection

2980273 to 2981079 (36/ 806)
▲​
2981824 to 2981882 (2/ 58)
2982174 to 2982474 (11/ 300)
 ▼ ▼
3280734 to 3281639 (34/ 905)
3281731 to 3282130 (15/ 399)
3283340 to 3287590 (171/ 4250) 
3289304 to 3289423 (6/ 119)
3291400 (1/ 1

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3291400 (1/ 1
3725636 to 3727887 (81/ 2251) 
3729658 to 3730454 (29/ 796)
3729856
3730877 to 3734204 (86/ 3327)
3734284 to 3735639 (34/ 1355)
4420014 to 4421831 (34/1817)
4422126 to 4423027 (11/ 901)
▲▲
43962 SN starts