I haven’t been able to do any further research but apparently the YMCA produced stationery specifically for soldiers writing home for Mother’s Day. I can’t imagine the YMCA thought that this would be used by a Canadian Forestry Corps company to record some productions statistics but it looks like they used anything on hand.
Anyways, Happy Mother’s Day!
POWs in Canada 
Michael:
What a find! Mother’s Day and Forestry production. Yup, makes sense. Mother’s can always multi-task…. or provide stationary when needed 🙂