I have a B17, Sperry K4, lower ball turret gunsight in nice condition. It has all the electrical connection ends capped since it was put into storage at wars end. It has a lot of spare parts to go with it. It also has the amber sunshade lens to go over the gunsight although the amber lens is cracked from age. I also have a type 1a astrograph in its chest in excellent condition. Spare parts for it too.
I had planned to get a manual and eventually power up the K4 gunsight for display purposes. But I do not have time for this and doubt I will have time in the future. So I have decided to sell both the K4 gunsight and the astrograph.
Package deal for both for $500.00 or K4 gunsight separately $400.00 and astrograph separately $125.00
Below are pictures of what the K4 gunsight and astrograph look like. These are NOT my items but pictures found on the net since I have not yet taken pics of mine yet. If you are interested in buying these, contact me via my e mail at
Akins_Bill@yahoo.com and I will take pics of my items and send them to you. Best to e mail me since I am not here that often to see any posts or I.M.'s that might be sent here.
Hopefully someone with more time than I have can fire up the gunsight for display. When I took the bulb cover off and shined a flash light into it, you could see the gunsight come up on the reflective lens. Also while seeing that, if you turned the knob, you could see the reflected brackets move back and forth on the gunsight reflection.
I have a B17, Sperry K4, lower ball turret gunsight in nice condition. It has all the electrical connection ends capped since it was put into storage at wars end. It has a lot of spare parts to go with it. It also has the amber sunshade lens to go over the gunsight although the amber lens is cracked from age. I also have a type 1a astrograph in its chest in excellent condition. Spare parts for it too.
I had planned to get a manual and eventually power up the K4 gunsight for display purposes. But I do not have time for this and doubt I will have time in the future. So I have decided to sell both the K4 gunsight and the astrograph.
Package deal for both for $500.00 or K4 gunsight separately $400.00 and astrograph separately $125.00
If you are interested in buying these, contact me via my e mail at
Akins_Bill@yahoo.com and I will take pics of my items and send them to you. Best to e mail me since I am not here that often to see any posts or I.M.'s that might be sent here.
Hopefully someone with more time than I have can fire up the gunsight for display. When I took the bulb cover off and shined a flash light into it, you could see the gunsight come up on the reflective lens. Also while seeing that, if you turned the knob, you could see the reflected brackets move back and forth on the gunsight reflection.
These pics are not my items, but are completely identical to my items.
E mail me if interested in buying and I will take pics and send to you of the actual items I have.
B17 bomber. Sperry K4, lower ball turret self computing gunsight. 
B17 bomber. Astrograph Navigational instrument. Kodak. Type A1. 
Linear Mode
