However, the only widths I can tell apart by looking at are the 5" wides because of the flatter spokes.
I found a thread on here that mentioned "4400-6" was stamped into the 6"wide rims (im now struggling to find the thread again!) but I have since seen some 5.5" rims advertised with that same number on the wheels

Can someone please confirm if the "4400-6" number ONLY appears on the 6" wides or not, no "think so's" please, this has to be right!

or
Tell me an alternative way of telling how to tell the 5.5" and 6" wheel widths apart by markings on the wheels and just looking at them.
Please dont say just measure the wheel, because if youre trying to measure the width with the tyres fitted (which most people sell them like) half an inch is neither here nor there

Many thanks.