Beginning of Minox Hyperfocusing

Early Leica camera lens had no depth of field scale.
Depth of field theory developed at around 1933, since then
many cameras include depth of field scale.
Riga Minox had depth of field right from start--
the { mark.

The practice of 'Hyperfocusing" was a later development.

For instance, Zeiss Contessar of 50s has a red '20' on the
distance scale, and a corresponding '8' on aperture scale-- indicating
that by setging the distance at 20 feet, and aperture at '8'
then everything from infinity to 10 feet will be sharp.

Many cameras of that vintage also have a red '*' on the distance
scale for hyperfocal distance.

Riga-Minox has no such hyperfocal point.

Since when Minox began using the concept of hyperfocusing ?

My first Minox IIIs of 1955 vitage has a red dot between
infinty and 6 feet ( so is my Minox B).

One day when I visited a camera store, I saw a Minox IIIs
in good condition without this red hyperfocal point ! I grabbed
it.
Check the serial number in Hubert E. Heckmann's authentic
book "Minox Variations in 8 x 11". I found out this Minox IIIs
without hyperfocal distance point was made in 1954, the very
fist year of IIIs model (1954-1969).

Since my 1955 Minox IIIs already has this red dot, I am quite
certain the hyerfocal point on Minox began in 1955 year ( or
slightly
earlier )

In the sixteen year run of Minox IIIs, only the first
year ( 1954) has Riga style focus dial --no hyperfocal point.

IMO, Minox IIIs with Riga dial are relatively scarce
---I estimated at less then 12,000 in existence

BTW, when looking for Riga Minox, if one sees a hyerfocal
point dial, then it must be a repaired model with post 1955 part.