Nathan #3 bell identifying info

quick question for Nathan k or p horns. is there a nathan horn made that has no #3 stamped on the side of the bell? actually no number what so ever.any other ways to identify as a #2 or #3 ?? maybe by length of the horn?

#3 bell is exactly 255mm measured from the front of the bell to the end of the ‘breast’ on the back cap.

Can you post a pic of it? I can tell you right off what it is.

I compared the pic to the bells on’s bells and determined it to be a #2.