Alan,
Both the discs and soil pulveriser was advertised in the 1920's and still seen advertised in the M-H Canadian Farmers Handy Catalogues into the 1940's, must of been well liked and successful implements to be available all that time.
Dakaota,
Welcome to Massey Collectors, great to see someone with interest in the older era of Massey rather than just the M-F Classics which seems to be the current "buzz".
There is a lot of interesting information amongst all the threads and discussions on this excellent site, there are some very knowledgeable Massey Collectors on here who will help you discover what a great Company Massey Harris once was, one of their best slogans I like is " The Sun Never Sets on Massey - Harris"
Enjoy your Massey Harris Collecting for many years to come.
Malcolm
Malcolm