Old hand carved asian nesting tables

I bought these nesting tables from a garage sale. The older gentleman just knew that they were handcarved and he had them for 40 years. I have stepdaughters that are Korean and love Asian art and I found them interesting myself so I bought them for $20. After looking on eBay I thought they might be worth some money but I cannot find any of our exactly like this.  It looks to be of a stamp on the bottom of one leg but I cannot make out what it says or if it is even a stamp or some residue. Does anyone have any insight on these tables?

Poor