With some more details provided on the warsailors forum, that confirmed the loss of Do 18 occured on the 1st of September, what probably happens from the available data was the following:
On 29 August 1941 the Ju 88 A-5 WNr 501 A6+KH of 1.(F)/120 went missing over the Barents Sea.
Two days later, on the 31st, the Do 18 G WNr 804 of 3./ Kü.Fl.Gr.906 rescued three of the crew, Lt. Ernst Pfeil (pilot), Uffz. Hans Quillberg (radio) and Ofw Theodor Thrun (air gunner) in Pl.Qu. 27 Ost/1330 (by 72°42’30’’ N 21°05’ E). The fourth crew member, Fw. Helmut Schneider (observer), was dead. The Do 18 was unable to return to base, probably due to damaged engines.
Next day (1 September) the German patrol boat VP Norwind arrived on the spot and rescued both crew at 0504 hrs. She then tried to tow the seaplane but it overturned and sunk. The ship arrived in Tromsö, Norway, with both crew aboard at 1925 hrs the same day.
Source:
http://www.luftwaffe.no/SIG/Losses/tap412.html
http://forum.12oclockhigh.net/showthread.php?t=32689
http://www.aviationhistory.no/ref_db...?lossid=160761
http://warsailors.com/forum/read.php...4309#msg-54309
http://www.historisches-marinearchiv...here_value=896
http://wikimapia.org/#lang=fr&lat=72...=21.083333&z=5
Thanks for the help, any comment is welcome.
Laurent