This set of kendo armor probalby dates from the 1940s or 1950s (just a guess from the context of where it was found).  It's clearly been heavily used judging by the wear on it and the fact that it could probalby use a good cleaning.  I have no idea if the set is complete as I am not a practioner of this sport.  There are a few labels on it giving the name of the previous owner.  There is no visible indication of the manufacturer.  There is also no indication of size.