Schneider Kreuznach & Zeiss Lens Value?

I'm not sure if this is the right place to put this post, but here goes anyway.. I've come into some lenses that I know nothing about. Not sure what to do with them, can anyone slap a ballpark value on them?

Schneider - Kreuznach -- Retina-Tele-Arton f:4/85mm
Schneider - Kreuznach -- Retina-Curtagon f:4/28mm

Carl Zeiss -- Pro-Tessar 1:4 f=85mm
Carl Zeiss -- Pro-Tessar 1:4 f=35mm

Speaking for the Schneider-Kreuznach lenses only, they were made for Kodak Retina cameras and specifically (I believe) the Reflex series. I actually have a Reflex with the lenses you mention and one of the earlier Kodak folders (Retina IIIC) so I'll have to check the interchangeability. [Added comment; not compatible with my Retina IIIC according to http://www.heritagecam​eras.co.uk …h-keeper-hood-3655-p.asp]

By the way search the site I've mentioned for your other lenses.

I've seen the lenses go for $50 to $75 on eBay with the higher end being lenses in good condition and with the "bubble" plastic case.