I am restoring a MM 403-4A Power Unit with a serial number of 02404975. Can anyone tell me what year this serial number would be? Thanks.
 
Gas or propane?

I have one on my sawmill and one for parts. There are some differences and I'd like to have a bigger pool to see what changed over the years. Could you post up some pictures?
I'll try to get some of mine

I believe 1 of mine was a 1947. And the other one is newer but never checked the sn. Both of mine are gasoline.
 

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