It would jive with a date of 1942, which many N^Z stamped LB's , 1942 Long Branch No 1 Mk 1* seem to be. If you want to trade, I have a good magazine , and a 1942 N^Z LB that would look good with a N^Z stamped mag.
Canadian made rifle, sipped to Asia, diverted to New Zealand, maybe went to Europe? then made it back to Canada.