When the original sweatband is in place for 60+ years it should be like this one,note the dirty part and the clean part which has been under the sweatband for years (if original to the visorcap)
Here's another one,again notice the "clean" and the "dirty"part of a sweatband sitting there for 60+ years...
I know where you're coming from but IMO these are not sweat/natural wear stains that you've pointed out. This visor has suffered moisture damage at some point in the past and water will travel up inside the side panels quicker than a rat up a drain pipe.
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