Here is another eBay find that I thought was worth sharing. This is a Wamco alphanumeric minitron display. It is similar to a numitron in that it is also an incandescent filament display but the packaging is significantly different. I believe these devices were primarily used in aviation because of their resilience but I’m having troubles backing up that belief with hard data.
Driving this device is easy – there is one common pin and the remainder of the pins correspond to a different segment in the display. I was powering these with 3V but for those curious, the full data sheet for the KW series in PDF format.