Choke

"ch78" possibly indicates CHamber 78mm, which translates to 3".

I do not see a choke indication from the info you provided.
 
Can’t find any markings.

Some companies use symbols or funny numbers to indicate choke. Your barrel is highly likely to be marked with the choke, not being marked would be unusual. The markings are also more likely to be above the stock line than below.
 
That's your chamber size. Measure your constriction (bore diameter-muzzle diameter) for a general idea, or look for another marking (often under the stock). It may be a decimal number, a series of zeros, or a choke marking. A constriction in the teens would be imp cyl, in the 20s would be mod, 30s is full, 40 and up and you're into extra full or turkey chokes.

However, this isn't always true - the best way is to measure the constriction. A bigger bore and a tighter muzzle would perform differently that a relatively tighter bore with the same muzzle.

EDIT: just saw your last update. If you can put a dime in there, it's most likely not a full choke.
 
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I'm not sure what nominal bore diameter Fabarm uses but .718 is probably going to get you into that IC to Mod range for choke. Even if you know the bore diameter then that only gives you a general idea of what you have and the only way to know for certain is to pattern the gun.
 
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