T a k u m a r  1 : 3.5  f = 50 mm  Model  II
Produced 1953 to 1954. Serial Numbers 356xx - 597xx. For Asahiflex IA. Updated Feb. 2026.

(Research Note: Since 2020 I have seen 1.41 % (187 copies) of the total estimated 13,300 copies made.)

LENS PRODUCTION  (∑ lenses)
​  ∑n = 187 Serial Numbers (SN) observed in 30 batches covering 10,689 SN min.< ∑ lenses < 15,854 SN max.
SN min. = accumulated total of serial numbers observed within 30 batches. 
SN max. = accumulated total of serial numbers observed between adjacent batches of other lenses. ​

​
35614 (1/ 1)

35861 (1/ 1)

35948 (1/ 1)

36511 to 36741 (4/ 230)

36953 to 37994 (15/ 1041)

38469 to 39311 (8/ 842)

39422 to 41991 (39/ 2569)

42427 to 42535 (3/ 108)

43083 to 43319 (6/ 236)

43660 to 43747 (5/ 87)

​

Serial Nos in 30 Batches (n /SN range)
​
43803 to 44125 (8/ 322)

44421 to 45770 (22/ 1349)

45809 to 46333 (9/ 524)

46715 to 47516 (7/ 801)

47637 to 47773 (5/ 136)

48004 to 48811 (14/ 807)

49204 (1/ 1)

49809 to 50109 (4/ 300)

50140 (1/1)

50255 to 51784 (8/ 529)

​

​
51119 to 51283 (5/ 164)

51481 to 51784 (6/ 303)

51853 to 51997 (4/ 144)

52137 to 52295 (3/ 158)

53156 to 53185 (2/ 29)

53590 (1/ 1)

53732 (1/ 1)

56642 (1/ 1)

57314 (1/ 1)

59712 (1/1)

​