How much in today's market is an oil painting, The Steppes, by Heinz Munnich worth?

The artist is deceased.How much in today's market is an oil painting, The Steppes, by Heinz Munnich worth?
Auction prices for;


Heinz Munnich ( - )


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Heinz M眉nnich (1921 - 1978) Germany


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Heinz M眉nnich (1900 - 1970)


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Heinz M眉nnich ( - )


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You should take your picture to a fine art auctioneer for appraisal and valuation.