looks like at least..
but if the black enigne mount isn't floating but instead was welded to the frame (factory?)
chances are it's not.
Wheel on the seat is certainly a rupp turbine,
can't see the axle hangers (such plates in slotted tubes have been used by rupp, clark, bug at times and a few others)
And frankly I wouldn't be able to tell Rupp hangers apart from Clark's tbh..
at least to me they look perfectly identical
Anywys..
that looks like a very nice kart (1969 Rupp A-Bone or not)
and fully restored will be a blast to ride and a gem to any collection (if done correctly)
'sid