Arsenal /99\

[Matchka]

Ok, here's another interesting arsenal, not shown on the 2018 list.

[running-man]

Where'd this one come from Matchka? 

[Matchka]

RM, After querying the Seller....  a better pic!

https://www.gunbroker.com/Item/894712585

[Greatguns]

So, it's an /0223\B stamp then. Man, Matchka, I was getting ready to ask where you come up with these odd items.

[Shoot The Refurbs]

I saw that one and thought the same until I noticed the faint 2 on the left, seller never responded to me about the stamp but glad he did for you. Oof on my part though. 

[running-man]

This is the root cause of many of the errata on Howie's old hand drawn arsenal stamp artwork.  The infamous /25\ is a prime example of this.  Take a fuzzy photo, run with it, voila new arsenal nobody has ever seen or heard of before.   

[Matchka]

Indeed.
I'm always on the lookout for odd sernos, arsenals, etc. While plausible, the 99 wasn't 100% - always those stampings juuuust below the crest of the stock. Similarly, the "no import stamp" claim; when it's faint/scrubbed or tucked neatly between the barrel and the gas tube.