The stamp on the left was initially issued in 1897 as Scott 100. The black overprint was added in 1915 and this created Scott 291 which appears to be your stamp. The value for an unused copy is $1.00 in Scott 2015 catalogue.
The stamp on the right appears to be from the 1923 series and is likely Scott 607. (assuming top perfs are 13.25). 2015 Scott catalogue value is $0.25 for used copy.
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