I wish I could answer this toeplate question on the Haines rifle, having handled it a number of times. But, frankly after handling some 400 rifles of Kindig's I cant remember every detail unless it was very outstanding. This leaves me with the opinion that the toeplate on the Haines rifle was not exceptional. In fact, I recall it being a rather thin brass piece running partway up the stock. I do not recall any engraving.
The rifle is indeed one of the best carved rifles---particularly stunning in the Honduras mahogany so similar to that found on early American high end furniture. Unless, someone knows better this may be the only long rifle stocked in mahogany.
It will be in the new Kindig collection book out in early 2015 with five photos--albeit none show the toeplate.
Wish I could offer more ...
Patrick Hornberger