The Mellotron Group

I'm guessing that no "masters" were ever on 3/8ths inch tape.
 
 
In a message dated 4/4/2012 1:17:35 P.M. Eastern Daylight Time,  
feline1@feline1.co.uk writes:

 
 
 
A melltron 'master tape' (on reels, not a tape frame) is being auction in  
the current VEMIA auction.
_http://www.spheremusic.com/Bargaindtl.asp?Item=9630_ 
(http://www.spheremusic.com/Bargaindtl.asp?Item=9630) 

I'm  intrigued as to its provenance...