Help identifying this Japanese tea cup?
I'm new here, and relatively new to collecting china, porcelain, etc. I found this cup at a thrift store today for 25 cents (U.S.), and despite not knowing anything about it... well, it was 25 cents and so cute, so what'dya do? I've searched high and low via Google and Japanese porcelain sites dedicated to listing common markings, and I've gotten nowhere. The markings are slightly faded on the right side of the symbol, but it looks like it's a mirror image of the left side. It appears like it's something akin to two sideways pi symbols with a circular figure in the center... the photos are here:
Bottom of cup with markings:
Any help would be greatly appreciated!