Not the usual signals emblem, though. Black background suggests navy (maybe very early?), railroad, or some other militia/security unit. Most tantalizing is that it looks like it once adorned a uniform...too bad this is all you have left.
Telagraphists.
See Bekesi's book on security uniforms, page 139, bottom right. It shows a collar device with this lightning bolt through a H$S
It is described as "a rare collar device" for telagraphists
Telagraphists.
See Bekesi's book on security uniforms, page 139, bottom right. It shows a collar device with this lightning bolt through a H$S
It is described as "a rare collar device" for telagraphists
