Lancaster production by mark
3 prototypes
3,434 B.Mk I.....3 turrets
300 B.Mk II....3 turrets
3,030 B.Mk III...3 turrets
180 B.Mk IV...renamed Lincoln
430 B.Mk X...3 turrets
32 B.Mk I Specials (Converted) Tallboy/grand Slam,usually with tail turret only
23 B.Mk III Specials (Converted) Dambusters - no MU turret
There were probably a few other non standard Lancs,but the great majority of Wartime Lancs had 3 turrets.
So approx 7000 a/c with 3 turrets and approx 60 a/c with some removed.
rgds LR