I looked and found a folder with a trioplan. This look ok? Worth what they are asking?
TRIOPLAN FOLDER
Its a VARIO... ?
there are a few traps for new players Nev...that seller doesnt know what he has so he has just listed it as Vario, however Vario is the name of the shutter, not the name of the camera or lens. The old Varios are very reliable but very basic shutters.
as you found out, a lens type e.g. Trioplan, was made at different speeds/aperatures depending on year and the camera it was fitted to. after a while it gets easy to recognise them straight away, until then you have to read everything written on the camera
Also that camera isnt a 120 folder either, so you would of had a suprise trying to load it with film. it takes 116 film (pretty hard to get), which is wider than commonly available 120 film...so that camera takes a 6.5x11cm or 2.5x4.25 inch picture with a 120mm lens.
from what you said you will likely be after a 6x6 with a 75mm-80mm lens or a 6x9 with a 105mm lens.
as mentioned earlier the faster lens are usualy found on the higher end cameras of the time so they will be more exspensive than cameras that look like the one you listed.
the 3 element triplets lenses such as the Trioplan, Trinar, Cassar, Radionar etc will be (should be) cheaper than the 4 element Scopar, Tessar, xenar, Solinar etc and the 5 element 2.8 Xenar and Heliar lenses found on folding cameras
best of luck in your hunt