A very interesting piece, sorry Joe I don't have any stove parts lists, just sales brochures.
I wondered if it is something to do with holding chain links, horse gears etc??
Alan now has a challenge in finding the parts list to match the number!!!!
I know I have seen the X prefix before but cannot remember what it was in relation to???
Maybe Tom can chime in here and remember all his parts prefixes and numbers??
A very nice piece of Massey history and curiosity, thanks for the pictures and detail, again something we would not of known about and never seen before had it not been for this website. Keep them coming that is what this site is all about, broadening our knowledge on "all things Massey"
Did you add it to your collection Gary?