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You have a coffee mug from Lefton China. The company was founded by Hungarian sportswear designer George Zoltan Lefton, Lefton China of Chicago, Illinois, which imported porcelain decorative objects. The number 07529 is the pattern number used and the mug is circa 1980s.
Regarding the value of your item, I have just perform a market research of similar sold items as yours. I performed the research based upon the most recent finished auctions and private sells, so the value given is the real market value of your item. This is the only way to know the exact value of your unit.
The value will be in the range of 25-35$.
I'm sorry if the value provided is not as high as expected but I have to be honest and professional with you so you won't loose your time and efforts.
Please, use the stars to rate my answer or let me know if I can help you any further!