Early 20th C. Signed Japanese Water Color, Illegible Name

Mexican Peso Price.  This is from an Estate that contained a number of dated and signed water colors from the early 20th C. in Japan.   The signed ones are by Chas. A. Wirgman, Jr and dated 1904.  This one is signed "T . Gawyama" ???  . This measures 26" tall by 19.5 ". Signed lower right corner.  There are 5 of these 100+ year old watercolors .. We have backed them all with acid free board but the matting is antique and needs changing to prevent further damage to the water color paper.