Franchi Choke Identification

[Pathfinder]

I have a 20 gauge Franchi approximately 20 years old. It is a fixed choke barrel, but does not indicate Full, Mod, Imp or other. I believe it has two stars stamped on it. This is a semi-auto.

Any way to know the choke code?

[birddog]

buy a micrometer and measure it.