[time-nuts] Thunderbolt - temperature

[GandalfG8 at aol.com]

In a message dated 12/07/2008 00:14:13 GMT Daylight Time,  holrum at hotmail.com 
writes:

when my  unit in the red metal box was open,  it was around  32C


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I'm intrigued by this and similar earlier references.
 
I've only seen Thunderbolts in gold coloured aluminium boxes, where did the  
red boxed version come from?
 
regards
 
Nigel
GM8PZR