Section 22
E{(tcl of sfaltmwf n/1'flle of eJ-·clu1If!.e 01 avu age pt itr.-Where an instrument contains a statPment of current rate of exchange, or price, a<> the case may require, and is stamped in accordance with such statement, it shall, so far as regards the subJect matter of such statement, be until the contrary is proved, to be duly c:tamped.