Solid question which has a definite answer. We are addressing 100% original helmets, original liners, not all oiled up, cleaned paint, with original chinstrap and tie string. Starting with a standard M.40 Heer helmet, with decent paint and decal (85%+ on both), the price goes from about $650 to $1500. You reach the higher end with more original paint finish, more decal, and of course, if the helmet is named with a feldpost nr. that adds to it. The M.35s were primarily issued in parade finish with double decals until 1940. Some M.35s were issued as M.40s. Many M.35s were simply overpainted, leaving the original eagle decal (the national colors had been ordered removed in 1940), or some were overpainted and new Heer decals added. A M.35 rework like this is about $550-1500 as well. Again, a name and unit, FPN, etc. adds to it. Hope this helps.