The Mark 1 interior has no stowage compartments, no drip rail, no inner gunwales (though these may have been added later), no stiffeners on top of the dagger board case, the thickened transom did not extend to deck level and there were knees from the side decks to side panels at the rowlocks and pads under the shroud blocks. This design was used on the first wooden boats, those with sail numbers 1 to 729+ (number of the last Mk 1 is unknown).
Mark 1 Mirrors also had no bow rubbing strake as can be seen in this picture.
