[Boatanchors] IERC shield types & suffixes

[hwhall at compuserve.com]

The basic sizes of IERC shields are encoded in the type numbers such as 6020,, 2015, etc. but I was wondering if anyone knows what the significance of the suffixes are.  I've seen shields without suffixes as well as suffixes B and H.  Google has not been very helpful on this.

Thanks & 73,

Wayne 
WB4OGM