Small Nippon Teacup

We purchased a box of old items at an antique auction 30 years ago and this cup and saucer were in it.  It appears to be hand painted and possibly bone china because it's a bit translucent. 

We could not match up the pattern anywhere and are baffled in that the cup is fused to the saucer.  It actually looks like it may have come that way, for whatever the reason.

Any info on this would be most appreciated including a valuation, if any.

Thanks,

Schnaps