I agree these were done by hand, but as far as "inspiration"... they seem to be all over the map. The R in the lower sample owes something to DIN but the C, A and G are way off. Top sample - slight resemblance to Trump Medieaval in the serifs but not the shapes.
Ya got me.
Top row - serifs inspired by Gerard Unger creations like Swift.Or in a wilder fashion by Emigr�.
Bottom G Trebuchet-ish. A Futura Condensed-like, or any deco era font. C is related to some of the sans serifs by Erik Spiekermann. R could be DIN or likewise.
Captured from web.archive.org on 16 May 2005. view this capture