Its known under several names.
Oldelft "HV5x80AT Mark IV
"OlDelft" is the Dutch manufacturer, they still exist, but make medical imaging instruments nowadays.
You can get practically the same thing (same opto-electronics package, but Zeiss instead of Leitz optics & a slighgtly different control knob layout) by buying one of the "Zeiss Orion 80 / Fero Z-51
" scopes still being sold online.
Here's a link to one on e-bay.
Allan Quartermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”