I have a new old stock tongue for a Massey Harris 33 horse pull Mower. After cleaning it up I discovered writing on the bottom it is done with yellow paint and a stencil. I can't make it all out but this is what I can make out. 
5 OM NO 33 MOWER. 
The part number for it is L5015. I am trying to figure out what the OM stands for. Any ideas?

It looks like you are making good progress on your mower Dan, not many restorers these days can go out to their back building and pull out NOS parts, your very fortunate in still having stocks of parts for some of your Massey projects.

Just a thought is "OM" " original manufacturer"??

Keep up the good work and enjoying your progress photographs.

Malcolm

My son said the same thing, but I have seen a number of Massey  parts with the part number painted on them and never saw the "OM" thing before. Looks like I will wait until I do some more research on it before I paint it on.