Friend dropped in.....

[Sapper740]

Could it be one of the old radio valve cases - as used for the 10 round Thompson gun magazine bozes. Easy to remove the yellowish hosehair matting and modify it for whatever you need......... like 10x 30 round Thompson magazines. Just a thought

Unfortunately the Case No.2 for the WS 38 has a piano hinge and the Case Spare Valves for the WS 19 has something similar across the full length of the back. All bits of kit for radios were stenciled or stamped with a number with a Z.A. prefix. I don't think Cinder's case is radio related.