c/n 2115368.
NATO codename:- Fagot-B
While the ‘bis’ had an improved engine and other minor changes, the bis(ISh) was a dedicated fighter-bomber variant with additional underwing hardpoints intended for free-fall bombs. A dozen or so were converted but it did not enter production.
On display in Hangar 8 (the original large hangar) at the Central Air Force museum, Monino, Moscow Oblast, Russia.