Hi John,
Nice work piecing this together.
The knapsack is an Officer's/Paratrooper's/Armoured Infantry musette bag, quite rare and difficult to find in good condition now.
I'm starting an update on the G519 serial number lists (it's been a couple of years, and there's a few more frames around).
Please could you confirm (if you want to!) the serial numbers on your frame. I read H187320, which would be the latest number recorded. Is the date 1944, and the other code number 3?
Also, there should be 2 or 3 numbers stamped on the back of the top of the fork. Are they readable?
Thanks for your help.
Best Regards,
Adrian