Serial numbers added in all lens categories this year significantly improved batch definition.
Now around 26,000 observed serial numbers in 4,000 batches give a mean of 7,900,000 lenses.
I feel the results are beginning to shape what must have been reality.
Standard preset Takumars (for the AP, S and K in 1957-1958) are in the Field Guide; now with graphics.
They demonstrate pre- and post production tweaking in the lab; rapid innovation in AOCo.
I hope there are some surprises and more questions than answers.