Do you mean a 1556 (H15)? This a little older than the H14/16. Different color scheme and such. The 1556 is a 1972 and came after the 1257 (1970) and before the H14/16. The 1256 and 1556 were available in 1972 as hydro models. I am pretty sure alot of the parts are gonna be the same on the H14 and 1556.