They are US Revenue stamps. The bank check used to be applied to checks, with a tax amount paid based on the amount of the check. (The pair at left are first printing). Later they stopped printing the "use of the stamp" and just wend to a standard "Revenue" stamps, that applied to anything that required collection of revenue tax. The one on the right is a 3rd issue revenue, 2cents. From 1940 onward, they were issued in red, various denominations, and then over printed with "Series ". The US laste issued revenue stamps in 1963.
Comments
The bank check used to be applied to checks, with a tax amount paid based on the amount of the check. (The pair at left are first printing).
Later they stopped printing the "use of the stamp" and just wend to a standard "Revenue" stamps, that applied to anything that required collection of revenue tax. The one on the right is a 3rd issue revenue, 2cents.
From 1940 onward, they were issued in red, various denominations, and then over printed with "Series ". The US laste issued revenue stamps in 1963.