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Hi, ajoblanca!

Finally I found the producing enterprize of your cups. It's Druzhkovka Porcelain Plant.
Address:
Pedagogicheskaya street 1
Druzhkovka
Donetsk region
Ukraine 84205

Also it...

For example you can use this site http://imageshack.us/ then insert url of image in any post here.

Maybe it means "Донбасс"?
Donbass is a big industrial region in Ukraine.
http://en.wikipedia.org/wiki/Donbass

I can not identify a factory though.

Edit: Perhaps it is not a lighthouse but...