I've got more information from the canadian war museum:
he 1st Cdn A.P.I.S. was an Air Photo Interpretation Service, not a squadron. The two most likely squadrons to be involved in a reconnaissance flight at that time would be 414 and 430 Squadrons. 414 were flying Spitfire Mk. IX aircraft at that time, and 430 were flying Mustang Mk. I aircraft. Each squadron has a history [see references below]; neither mentions an officer named "Tozer".
There is a "G.R. Tozer, F/O, (2P) RAF143290, (Sep 44 - Dec 44)" listed on the "437 Squadron Names of Personnel" site. However, that squadron was a transport squadron formed in Sept. 14 and first used in action that on the 17th at Arnhem towing gliders behind Dakota (DC-3) aircraft. It would have been difficult for a pilot to make the transition between a single-engined aircraft like the Spitfire or Mustang to a twin-engine aircraft like the Dakota.
F/O Tozer of 437 Squadron might not be the same as the Tozer of the 1st Cdn APIS. The name on the photograph might be the name of an analyst in the APIS, not the pilot.
In summary, it seems likely that the squadron involved in the flight over The Hague on September 13, 1944, was from either 424 Squadron (in which case, a Spitfire Mk. IX) or from 430 Squadron (a Mustang Mk. I). You might be able to get more information from Library and Archives Canada (LAC) related to those two squadrons.
so the question remains: who flew on 13 september 1944 a reconnaissance mission above The Hague!
It is 1st Canadian Air Photo Interpretation SECTION. As I have pointed out above, they were attached to No.35 (Recce) Wing, 84 Group, 2nd Tactical Air Force, supporting 1st Canadian Army.
No.424 Squadron on Spitfire IX none of their aircraft were equipped for aerial reconnaisance photography = not them. They were a 'pure' fighter squadron, mainly conducting fighter bomber operations at the time.
No.430 Squadon RCAF, none of their operations on 13 September 1944 were successful - only two sorties, both aborted due poor weather, neither anywhere near The Hague. No photos taken.
F/L G G Tozer RAFVR of No.IV(AC) Squadron RAF conducted a successful sortie on 13 September 1944, with his photos being processed though 1st Canadian APIS as per usual due to their attachment to No.35 (Recce) WIng. He covered Boulogne.
I suspect the person who sold you the photo - or someone who labelled the photo at some later date from memory not at the actual time - did not know the proper location shown in the photo and incorrectly identified it as The Hague.
In reviewing the Operational Record Books for the Reconnaissance Squadrons that 1st Canadian APIS was supporting on 13 September 1944, NONE of their sorties covered The Hague or went anywhere near The Hague. Primary focus for the operations that did take place that day, due to the weather conditions, was along the French and Belgian coasts covering 'hold out' ports and areas still under German control, and around Eindhoven, Nijmegen, Arnhem, with a couple of sorties around Tilburg and Hertogenbosch.
On any of the edges of the photo that you purchased, does it include an information strip? This would be a series a words, letters and numbers that identify the unit, task number, date, altitude and sometimes the pilot involved. From your original post, if that strip included 'R4/832' that would indicated a sortie by No.IV(AC) Squadron RAF and being the final three of the serial number of the aircraft flown by F/L Tozer, being Spitfire PR.XI PL-832.
Absolutely no connection to F/O G R Tozer on No.437 Squadron RCAF Dakotas.