| The M31  gallery of  reverse plastic:
 Barlow 6T-180  4 1/4"H x 2 3/4"W x 1 1/4"D
aka Crestline 6T-180.  Several US portable radios employed a similar "speedometer" tuning dial scheme, but I think this is the only shirtpocket set to do so, Japanese or American -- and this one went so far as to use Pontiac's arrow emblem as its dial pointer!
  
 
 
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