[Boatanchors] darn foreign schematic symbols

[Dick KF4NS]

Hope someone can help. I have a schematic of a Japanese HT from the 
early 80's or maybe late 70's with a symbol I hope I can describe 
properly. Searches all over the Inet proved fruitless.

It is a pair of vertical dark lines with lighter slant bars between 
the vertical bars. I of course suspect it is a condenser of some sort. 
I went through all my dozens of tech books but only found something 
close just once. It was described as a polarized capacitor but if so, 
no way to determine the polarity. Weird !!

Any ideas?

73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!