On the proof marks Crown/G denotes a Rifle barrel; Crown/S denotes a Shot barrel & Crown/W denotes a Choked barrel. If choked the Crown/W will e in addition to the Crown/S & simply denotes a choke with actual amount not specified. Can be anything from .2 mm (.008") on.
When the poster on that other forum stated the 16/1 meant that barrel was full choked he was simply in Error. 16/1 denotes a size of .669" which is .007" larger than a nominal diameter of
.662" for a 16 ga so quite obviously not a choke size for a full choked 16ga.
Hal if the gun in question has a Crown/W on either barrel then that barrel was not Cylinder bored, but choked to some extent which only measurement can determine. If it is cylinder in one barrel & choked in the other then only the choked barrel should have the Crown/W mark.
