So...  Somewhere in the dim recesses of this 66-year-old mind lies the history of this cap.  But I'll be damned if I can remember anything about it.  I emailed MEARS, since it bears their sticker, but no reply.
Can anyone provide any info as to the approximate years this style and manufacturer cap was in use?
Thanks!
PS:  The cap is available.
 
 
 
