First, they are not tropical, they are ordnance tan. It is a myth they are tropical. I have not seen unmarked glasses, but they look OK based on your one small picture. Too me, it is the case and neck strap that are the important part that they are period and in good condition. Clarity of the lens is important too. $200 is on the high side of average though. I only have one set left and it also has the leather tab for attaching to the tunic and the rubber eye piece covers. They are even more difficult to find than the other parts.
Si vis pacem, para bellum