Hi, Junior,
I don't know what you want to know. The Fox Model B was the last of the guns with the grand old name of Fox, but it was not of the quality of the older guns. It was an inexpensive side-by-side double, made in 12 and 20 gauge and .410. Some had a single selective trigger and selective ejectors, and these add some to the value. Quality was so-so and reliability poor, at least considering the number I had to fix.
Value in top condition is $300-400 strictly as a shooter. There is no collector value.
Jim