I have tea set made in japan late 40's how do ifind out if valuable?

Question:

Answer:

If probably is very valuable. And even more so if the set is complete, in mint condition, and have some rare designs or decorations.

What you want is to have it appraised by an antique china or porcelain appraiser. Clean the set with warm mild soapy water. Do NOT use any abrasives. DO NOT try to fix any chips or cracks. Take a picture of the whole set, individual pieces and the emblem or maker's mark on them; they are typically at the bottom of the porcelain.

There are some websites that will give you an idea by the emblem or maker's make. For example, http://www.kovels.com/

But don't just go by one appraisal. Get at least 3. Good luck,