Thank you for submitting your item for appraisal. This appears to be a serigraph in colours by Morton Wayne THIEBAUD (1920) from 1956, signed in pencil. The artist has been very productive in his life and some of his later prints or monotypes have sold for much higher prices. One etching with watercolour even selling for a quarter million. There might be some active pushing prices and speculation on the way right now.The estimate is based on auction results for similar prints of the same period. There is no measurement for the sentimental value you might attach to it.