I'm reading the serials as C1441410 and C1441294 is that right?
If so both of these machines are in the postwar keycards but I'm assuming this picture was taken before the end of the war as they still have blackout masks fitted?
The keycards were created at least 4 years after this picture was taken and have the following final information.
C1441410
Post war Registration 23YD81
Frame or perhaps engine number 19172
Contract No. or perhaps rear mudguard section C6126
S/O MOS HAL/1/58 4.5.55
C1441294
Post war registration 46YD47
Frame number 103 ????
Contract No. or perhaps rear mudguard section C9310
221 BVD Singapore
5/69 (sold off)??