Siemens 5w Neon glow lamp

A rather nice example of these rare Siemens lamps I managed to purchase on Ebay recently for a ludicrously low price. According to the seller, this lamp did not work (hence the low price), but that is obviously not the case. Regardless, the lamp is obviously fairly well-used as the electrodes exhibit visible darkening in spots (slightly less visible when lit). Despite this, all markings/etches are still very legible, much more so than the other one of these lamps I have in my collection.