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Great tip will post results

No joy none of mine have the enlarged belly. Let the hunt begin.

I will measure the "belly" and take a profile photo. If it is not a 18/55 I guess the hunt is on now that I know I am short one.

Now I feel silly. I thought the update was in the metal end of the pommel. I looked again at your photos after you described the "belly".

Better angle?

I thought it was. I have looked at all the photos here and on the internet and the differences are quite subtle (at least to my eye).
I will attempt some better photos and post for review.
...

Left to right 1899 1889-18 1918 1918/55 I think I got the designations right.

My 1918/55 has no serial number. Oddly most of these came from Midway USA a few years back.