D Shackman & Sons polaroid land camera Model PL1

Description

D Shackman & Sons Polaroid Land Camera PL1 and
Dallmeyer Oscillograph Anstigmat lens F=3" f2.8-f16
I haven't fully tested this camera with film, but shutter and iris both work great and no rust is visible anywhere. Camera seems to be in perfect working condition. This particular camera has probably been in use in one of the laboratories of Helsinki University of Technology.
I'm not sure but assume that frame size is One Hundred Polaroid Film
Shackman designed Polaroid cameras for specific purposes, among them taking multiple passport photographs, or for technical use like oscilloscope stills.
Polaroid Land Camera Model no.PL7 Serial no. 173
Made in England by D Shackman & Sons, London & Chesham
Inside on back of lens iris is f2.8 - f16
Main body is a black colour with silver fittings.
An unusual camera, any information about this particular welcome, any questions I will do my best to answer.