ECM ID

[bruce plecan]

1600----, also seem to be a new number series for
pcm, bcm, ecm.  
May be a source code for tracking warranty replacements
also.  Some other manufacturers change part no, when
changing vendors for tracking warranties, quailty control
etc.  
Got digging in my inventory, some that still have the 
original paper tags, have a 16------  number on the 
lower half of of the perforated tag.
Don't know if that really helps, but is all I have on the 
issue
Bruce