Has anyone got one of the luminous identification discs or can anyone tell me the sizes (diameter/ thickness)?
I'm looking at running up a few myself.
Also what's stamped on the back? Is it -
"POISON
INSIDE" ?
Bit of an unnecessary item I know but if I can make a few myself, why not.
Free disc to anyone who can supply the info! 
http://www.pararesearchteam.com/Airborn ... e-014.html
Confirms 'POISON INSIDE', and states that the luminous disk is 'about an inch in diameter' ............. should be able to work out the rest from that ?
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Thanks Joker! Great resource there. Most of the images I've found are smaller versions of those. Should be able to start making some tomorrow!
Got the first batch done today
They came out ok, could have done with a deeper engrave setting but they're fine for now. They're 2 layers of 2mm acrylic with a luminous paint so no radiation! 
Here's the discs after about 30 seconds exposure to a lamp. I Imagine if they were to sit longer they'd be pretty bright.
I have one for Joker as thanks for supplying the info (pm me your details and I'll send it off) and at the moment I have 2 spare I'll put up in the for sale section. If there's more interest I'll do another batch.