Some links I came across during research:
https://www.worldwarphotos.info/gallery ... nier_do17/
And is this the one ?
“Dornier Do 17Z Werknummer 1160
On 3rd September 2010, the RAF Museum announced that a Do 17 had been discovered in 50 ft (15 m) of water off the coast of England. The aircraft had been discovered in September 2008 on the Goodwin Sands, a large sandbank 6 kilometres (3.7 mi) off the coast of Kent, but the discovery was kept a closely guarded secret. The Dornier Do 17Z-2, Werknummer 1160, built under license by Henschel with the full Geschwaderkennung (combat wing aircraft ID code) of 5K+AR, was operated by 7 Staffel, III Gruppe, Kampfgeschwader 3 (KG 3).
Restoration project. The fuselage, upside down with the cockpit area nearest the camera
On 26th August 1940, 5K+AR was taking part in a raid by KG 2 and KG 3, targeting the RAF stations RAF Debden and RAF Hornchurch. While flying over clouds, the aircraft became separated from the bomber formation and lost its bearings; it was then attacked by Boulton Paul Defiant fighters of No. 264 Squadron RAF. One of the Dornier’s engines was disabled and the other damaged, so the wounded pilot, Feldwebel (Flight Sergeant) Willi Effmert, elected to make a crash landing on the Goodwin Sands. He and another crew member survived and were taken prisoner. The other two crew were killed; one is buried at Cannock Chase German war cemetery and the other in the Netherlands. The identity of the Defiant that shot down the Dornier is not certain – it may have been one of three 264 Squadron aircraft that was shot down soon after in a battle with Messerschmitt Bf 109 fighter escorts from Jagdgeschwader 3.
Restoration project. Port engine nacelle; note the tyre is still pressurized
In June 2010 diving operations were carried out and the survey report indicated that the aircraft was largely complete, although 5K+AR lay inverted on the seabed, indicating that it ground-looped on landing. The port rudder, starboard stabiliser, forward nose glazing, undercarriage doors and engine cowling were missing, but the discovery of a small debris field associated with the wreck indicates that some or all of those parts may still be present at the site. Some items, including two of the Dornier’s six MG 15 machine guns, are missing and are believed to have been stolen by unauthorized divers sometime after the aircraft’s discovery.
It was then taken to the Michael Beetham Restoration Centre at the Royal Air Force Museum’s Cosford site, where metallurgists from Imperial College London have a significant role in the post-recovery conservation of the aircraft.”
https://en.m.wikipedia.org/wiki/Dornier_Do_17
You would really need a Werk nummer to be sure.