I’m pretty sure that’s a regular sized Sexto. That photo makes it less obvious but the additional photos show very clearly there is additional length beyond the thumb notch and the width of the scales at the toe are wider than the width of the blade and guard. The other tell-tale is the tail, the bantom (mine anyway) doesn’t have the slightly larger rounded finish, the tail on my bantam tapers to point.
Great find for sure.
Great find for sure.