Not sure if there was a variation in the grip cap. What are the initials forward on the underside of the left tube? This example will be about the midpoint of production of the 2nd series. The platform w/ belts & braces, tube steel, wood, adornment by Fritz Heimbeck, etc., all being unmatched & unparalled... There may have been 2 generations of Fritz Heimbeck's tap, tap, tap adornment. Do note that on the underside of the left tube it appears that Excelsior was stamped in reverse prior to being applied proper.
Cheers,

Raimey
rse