GE 120v AR-1 Argon indicator lamps

By far one of my favourite finds of the lot. These are rare even in the USA where they were intended to be sold, so how these made it over here is a complete mystery. They are one of the principal reasons I bought that whole Ebay lot, in fact I assumed they were the much more common GE NE-1 lamps which are identical when off, it was only when I tested them I found much to my surprise that they were in fact the much more interesting argon version! Sadly the newest-looking one is EOL...