There are so many fine nuances in a Lehigh that are not on any other style of rifle. First, not a straight line anywhere on the buttstock. Three different radii make up those graceful curves. V-shaped, ultra slim fore ends, with little or no web at the breech, an above center lock location, wider than high, "flat diamond" shaped wrist, and a sheath type buttplate, all add to the mix.
The KRA has a gr at CD, has great examples of originals, if you want to pursue them further.
Hope that helps.