Up Anssi's Collection | Light meters | Drem Instoscope

Instoscope-01
Instoscope-02
Instoscope-04
Instoscope-03
DremInstoscope_CC1936
Instoscope_Life1937-7

Instoscope was released in 1935. It is otherwise identical to Justodrem, but the scheiner scale is different, and the biggest f-stops are 1.4, 2 and 2.8 (instead of Justodrem's 2, 2.8 and 3.5). Does anyone know the reason for that?

My Instoscope came from London in good condition and with leather case.

JAlbumChameleon