Thank you, Spektor; your find allows to link this portfolio with other photos sold on eBay in March 2017 ! This rare portfolio stemming from Uffz. Otto Twupak's heritage - he died 7 June 1944 as he stalled his Erla Leipzig built Bf 109 G-6 W.Nr. 412440 "Weisse 11" trying to regain altitude over Fl.Pl. Le Mans, France, under attack by 8th Air Force P 47's.
The first part of this set shows him aboard and around WNF built Bf 109 G-6 W.Nr. 15 772 "RH+JM" "Weisse 2", as he is being celebrated possibly at Wien-Seyring after 10 October 1943.
The second part does show him - at Wien-Seyring or Frankfurt-Eschborn - in front and aboard an Erla built Bf 109 G-6 "Weisse 8" which shows all the features of a standard early 1944 G-6 with short radio mast and D/F loop. It's W.Nr. is uncertain as, for the known 4./JG 53 losses, two "Weisse 8" were lost in May 1944 : W.Nr. 412380 and W.Nr. 412447.