swiveling WW2 seat?

[fiftycal]

im trying to identify this seat, i thought it was a B-17E or F navigators seat but cannot find a good picture of one. i guess it did swivel

 

[Airframes]

Has the look of a B-17 E or F radio operator's seat.

 

[Wurger]

B-17C

B-17E

B-17F

B-17G

The pic source: the net.