Hellava gun/! I was raised with one that my brother has from my Dad's estate. Browning Patents.....Not a big buck gun unless mint, a Sportsman or U.S. marked with a solid rib. 20's and 16's worth more. Minty gun w/o rib at 400 or less. Most of us "mature" guys like them and remember....Should be a flat matte finish, if all I know of prevail. Refinish makes it worth 60% of value..........That's what I see, off the top. Good fortune with the observation and need. MIKE 8)
Mod 11s have little collector following. Most have been shot to pieces. Just like the Browning A5, they require that you reverse the recoil ring between field and heavy loads. Many owners didn't bother so finding a solid one is somewhat iffy.
They're no where near the finish of the Browning, but I have to say that a mint gun with the original Remington rust blue finish is a very attractive shot gun. One of my brothers-in-law feel into a 20ga a number of years back which I would own today if it had had a rib barrel.