It's one of the things that are different between the Sergeant's Special and the Stoddard's Special.

That immediately came to mind when you posed the question because my Q2 2016 order was a Sergeant's with Stoddard-like options.

My invoice looks like this:
SERG
NS1
ASP
IW
SFG
WT
***NOTE*** Thin Butt Cap
_________________________
Rob