Okay now we can see it's clearly a early C grade. Not collector quality but seems to be in nice enough condition. Seems is the operative word. As far as a value goes, we don't know barrels length, chokes, LOP, DAH etc. All those things contribute to making it more or less attractive. The vintage market isn't vibrant for 12 gauge, unless its a very special gun. This is not a very special gun. But it's a nice one.
In the US I can quickly find a dozen C grade 12 gauge Foxes. Ranging in price from $3000 to $12,000. I would suggest this example might fit at the lower end of that scale. So maybe $3000 to $5000 if it were in the US......that's asking price. I'm not following it close enough to get a sense of actual transaction price.
Using my usual formula for Canadian pricing, I take the USD numerical value (in this case the mid point of my range....so $4000), use that number in Canadian dollars and discount it 10%. That would give me a Canadian asking in the $3500 range. Everyone is free to quibble and I'm not following higher graded Fox 12 gauges in Canada closely, but that process I just described generally gives me pretty good valuations.