Scott #233a: 1893 4c BLUE Columbian, Color ERROR. It is widely believed that less than 200 examples of this stamp exist.Reverse (Gum Side): Original gum. Faults / Imperfections: Negligible gum spot. The item pictured is the actual item you are purchasing, unless otherwise noted. I also offer an interest-free layaway plan. Do you have a question about getting this stamp Expertized? Or just about anything else? Some of My 92,000+ Feedback Comments. This item is in the category "Stamps\United States\19th Century: Unused". The seller is "gsquared7" and is located in this country: US. This item can be shipped worldwide.