The Mellotron Group

I don't necessarily believe serial numbers had that much to do with it. I  
am more and more convinced that serial numbers do not always reflect the 
order  of construction.
 
 
In a message dated 12/24/2009 1:38:25 A.M. Eastern Standard Time,  
markpringnz@yahoo.com writes:

Well  it wasn't that early on! #1565 has one and I think they only started 
using the  new controller card around the time #1565 was produced so 
wouldn't most M400's  have the cm10, mine sounds ok, I  think!