T e l e - T a k u m a r   1 : 5.6 / 400 
Produced 1965 to 1971.  Serial numbers 1097xxx - 3922xxx. AOCo Product No.370 (43700). Honeywell Pentax Cat.No.894. Updated Dec. 2018

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(Research Note: Since 2010 I have seen 1.28% (94 copies) of the total estimated 7,300 copies made.)

LENS PRODUCTION  (∑ lenses)  ∑n = 94 Serial Numbers (SN) observed in 33 batches covering 2,638 SN min.< ∑ lenses < 12,031 SN max.
SN min. = accumulated total of serial numbers observed within 33 batches. 
SN max. = accumulated total of serial numbers observed between adjacent batches of other lenses. 

​
1097211 to 1097319 (7/ 108)
1232789 (1/ 1)
1364674 to 1364872 (5/ 198)
1369169 to 1369214 (2/ 45)
1449890 to 1449918 (2/ 28)
1781287 to 1781440 (7/ 153)
1807313 (1/ 1)
1861605 (1/ 1)
1881157 (1/ 1)
1881622 (1/ 1)
2358090 to 2358447 (7/ 357)

 Serial Numbers in 33 Batches 
(n /SN range)

2462387 to 246556 (5/ 169)
2482422 (1/ 1)
2520000 to 2520005 (2/ 5)
2570008 (1/ 1)
2723006 to 2723406 (6/ 400)
2933095 to 2933175 (2/ 80)
2937524 (1/ 1)
3048943 to 3049025 (3/ 82)
3060084 to 3060152 (3/ 68)
3080084 to 3080195 (2/ 111)
3247180 to 3247277 (3/ 97)

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3253534 (1/ 1)
3253640 to 3253846 (8/ 206)
3355382 (1/ 1)
3356239 to 3356264 (2/ 25)
3568522 (1/ 1)
3773510 to 3773566 (2/ 56)
3906056 (1/ 1)
3906191 to 3906274 (3/ 83)
3916520 to 3916862 (8/ 342)
3921429 to 3921441 (2/ 12)
3922420 (1/ 1)