Glass Indicator Lenses or ??...and from what ?

[bradsguns]

I found a bunch of these in a box I got at auction. Some are red, some green. They are glass. They look similiar to some motorcycle signal lenses that I have seen, but not exactly. These have more of a domed top as opposed to the bullet look. They have a fairly wide rim (1/4"). Base diameter is 1-3/4", stand 1-1/2" tall and the hole in the bottom is 7/8" diameter and 1-1/8" deep. Marked with a "K" at the top...maybe Kopp glassworks ??

Any other ideas or specific fit would be appreciated, as I plan on selling them.
Brad

 

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[digging wv]

Could be lense covers for indicator lamps. ie. go-no go indications

 

[traderoftreasures]

bow lights for a boat green goes right red goes left.

 

[Rmeav8r]

Could be for aircraft use also. Same as for boats, Red on left, Green on right. Glass covers similar to those has been used since the 1930's for all types of aircraft. Yours look like those used on vintage aircraft. To the right person they could be worth a few bucks!
Photos of some below.

Scout