gentlemen,
thanks a lot for your support and interest!
Yes, Lt. Sheldon was definitely with the 60. Sqd. SAAF (South African Air Force). They were based at San Severo and were equipped with Mosquito Mk. XVI. So was 680. Sqd of RAF (part of No. 206 Group).
So they had the same base, duties / missions and aircraft. I think they used the same mechanics and probably interchanged their aircraft as well. The paint schematic was nearly identical too.
See here for 60. Sqd.:
http://www.saairforce.co.za/the-airf...uito-pr-mk-xvi
and for 680. Sqd. here:
http://www.cbrnp.com/profiles/quarter2/mosquitos.htm