Confirm arsenal stamp?

[Matchka]

Reached out to the seller. No reply, so far.
Doesn't look like /26\. 

https://www.gunbroker.com/item/893025755#.YDKZ4yBeP9A.mailto

[hoopharted]

looks like 36 , never heard of it , or rounded corners of the triangle , but i am far from a expert

[Greatguns]

Arsenal /316\, bottom left on chart below.

[Matchka]

I was leaning towards 36. The rounded corners - ditto. Can't find previous example with no mid line like the 316.

[hoopharted]

yup , damn , thats spot on , well done

[Greatguns]

/316\ is the only rounded corner arsenal stamp and, to date, there is no arsenal 36. Closest to this would be arsenal /136\ (upper right corner in the chart). Given that, I blew up the image and there is definitely a 1 line between the 3 and 6. It's faint, but you can see it at the top between the 3 and 6

[Greatguns]

Also, I think that is going to be a '72 1.7M by the SN. One of the "harder ones" in the dating sheet.

[running-man]

Def a /316\.  They are very distinct with the rounded corners like GG says. 

[Matchka]

Def a /316\.  They are very distinct with the rounded corners like GG says. 

Sounds legit.