Hi Garymh,The compact binoculars have a totally different serial number run to the full size binoculars. Likewise the Leitz (series 2) Trinovids from 1963 to 1989 have three separate serial number runs for 8x32/10x40, 7x35/8x40 and 7x42.
Could I bother you for a few dates please ?
Leica Trinovid 8x40b #805418
Zeiss Diatyl 10x40B #1603242
Carl Zeiss Diatyl 10x40B #1011117
Really appreciate any help