If they used the same format as Singer in the US - than Yes, that would be January 1936. But that is just the last time the manual was revised - so there may not have been reason to change it after that. This style of machine came out in the US around 1931 (the 15 with reverse).
BTW - this style of 15 is my favorite machine to FMQ too. I prefer to use a new style hopping foot.
