The only place I have seen these was in the upstairs shop over the hobby shop in Strasburg close to the
Strasburg RR/Pa. RR Museum. They are, I think S Scale, and I don't think???? still available. I was envious
of some of them as vehicles I could have used in an O scale version and THINK I may have, some years ago,
before internet, written the company asking for 1/48th versions, and arguing that the market would be bigger
for O scale versions and would include 1/43 vehicle collectors as well as train nuts. Do not remember getting a reply. This, of course, is another model vehicle question "how come they make these in 1/32nd, 1/26.5, or other oddball scales?" 1/64th, of course, is not an oddball scale, and these should have been, and luckily were, made for that scale. I would guess a number are in use in background, perspective deepening, applications on O gauge layouts, although they were as expensive as Brooklins.
I wonder if anybody knows the history of this company, DeHanes?