Barrel browning pump 20 gauge 3 inch BPS tubes

The barrel is in excellent condition and reads as follows.
Invector plus BPS special steel 2 3/4 and 3 inch 20 gauge  field model 26 inch. Made in Japan. 
it has a choke tube  in the barrel with four slashes (improved  cylinder) and  it comes with a spare full choke invector plus tube.