[Premium-Rx] Racal 1792 frequency standard

[GandalfG8 at aol.com]

Hi All
 
I've just bought a Racal 9420 frequency standard as this is a better  spec 
drop in replacement for the 9442 used in the RA1792, RA1794, etc etc.
It turns out though that this one is actually a 9420P, with the P looking  to 
be an adhesive letter added to the nornal 9420 label.
Also, my first impression is that it's taller, at 3 3/4 inches, than a  
"normal" 9420 or 9442 but my sets are in storage so can't make a direct  comparison 
and might be wrong on that anyway.
 
Anyone got any idea what the P denotes?, and confirmation on normal height  
would be appreciated too.
 
regards
 
Nigel
G8PZR
 
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