What is the value of your 15 jewel 14k gold open face American Waltham pocket watch -works number 9726454 made in 1900 The case is by WK Vanderslice?

The value of a 15-jewel 14k gold open face American Waltham pocket watch, particularly one made in 1900, can vary based on its condition, market demand, and specific features. Generally, such watches can range from $300 to $1,500, with higher values for those in Excellent condition or with rare features. The case by WK Vanderslice may add some additional value, but its impact would depend on the overall condition and craftsmanship. For an accurate appraisal, it's best to consult a professional watch appraiser or auction house.