Made for ultra portability fits in an 8x11x 2.5 inch case when the thyratron and vibrator are removed from the chassis and stowed near the hinge. What war time use was there for such a small 'scope, with in-the-field 12V supply capability? War finish presumably means the off white enamel rather than black crackle finish. Plate on the brown casing lid Miniscope Miniature C/R oscilloscope Pattern No 58259
Stencilled labels on the case are R.L. 4 and No 1
Presumably somewhere would have info on the pattern number. Even using "-dr who" googling does not find anything on Miniscope or that pattern number, plenty on the 6K25 thyratron but nothing on 9 pin VR91,
10E/92 voltage regulator? or 9 pin CRT VCR 522, 10E/787, Design Inspected CRT 4 (shattered probably when the shoulder carrying strap broke and corner brace broke off and split occured in the "suitcase" ) no other valves, also Masteradio G650 12V vibrator, military trident symbol in a couple of places , after an A on the VR91 and before a Z on the CRT side panels missing, someone has crudely bodged in pot .
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on