Unregistered

I have an oil painting signed by Harry Hoffmann 1961. The painting and frame are originals. My parents purchased 5 from the same gentleman while stationed in Germany. On the back of the frame there is a piece of paper that has the following information:
harry hoffman.kunstmaler
bad ems schillerstraBe2
telefon 2046

The name of the painting is written on the frame..
Wasserfall @/munihen

I'm trying to find out the value of this painting for insurance, and living in the middle of Kentucky there's really no place I trust.

Any info you can give me will be very much appreciated!
Please email t_n_t_brat@insightbb.com
Barb