In pouring over the many pairs of variable density goggles on I PAY, I have noticed
that there are a ton of examples that have the adjustment knob in fron and the flip up braket to hold the red lenses...
Then they are just a few that do not have the flip up bracket and they just have the knob in front to darken the view...
And then scarcer still.... in fact there were only2 that had no flip up bracket and no knob but instead had a horizontal lever at the top front that slides over and darkens or lightens the view. One is for sale from protugal
Here is the link
Do you think what the seller says is true? Rare Prototypes???
Well they are rare I'l atest to that but Prototypes???
Here is the normal pair most of us are familiar with.....