What value is 1914 1918 and man on horse on back worth?

The value of a 1914-1918 stamp featuring a man on a horse varies based on its condition, rarity, and demand among collectors. Generally, these stamps can range from a few dollars to several hundred dollars if they are in Excellent condition or part of a rare printing. For an accurate valuation, it's best to consult a stamp catalog or seek an appraisal from a reputable dealer.