I have seen those visors before in conjunction either with the China expedition or the experiment of 1905. Of course the guy that listed it butchered the marking. Really is EBRJR53 which makes sense to me.
I think they are olive in color. I am with Joe I think this may be a good helmet? There are similar examples in the back of the old Eric Johansson book.
Joe can explain the marking s way better than I could
Looks good to me....a rare erzats helme. Too bad the chin strap is broken. We have a pic of one of these in the chin strap thread. Weird that has a Bavarian kokarde on it though.