Hi Lyndon.
Looking at 6601572563 it looks good to me, but at $650, I think it is a high price, but it is complete, it depends on how much cash you have on hand, the value should continue to go up. The only problem I can see with it, is that it looks like it has been oiled.
As for 6602902051 the helmet itself is of no real value, the device on the front of it is referred to as a Stirnpanzer or brow plate (frontal armor) The stirn panzer is the item of note, it is very possible that it is real, but it lacks any original finish and does not have the strap (common condition for these) and could bring between $500 and $900, the Strinpanzer is not often found due to the fact that there were not many made.
Gus