1) Rock Island, 1918, number 401657, 16" blade, dark parkerized, with ribbed wood scales and sheath. 2) As 1, with 1917 date, 288912 number. 3) As A, with blue finish, numbered 400691, with ribbed plastic scales. 4) As A, 1919, number 423859. All are in good to very good condition, as arsenal reconditioned.