MF302 loader Backhoe Restoration

[massey302]

I just purchased a MF 302 L/BH,im trying to get the the spec's from the serial #JNM 119700276 ie. year and what does the JNM prefix specify? The tractor has a MF300 loader & a Ford BH on the rear. Perkins diesel. I have spent hr's on the net only to find alot of incompleat info. this old girl runs like a top but is going to need a bit of restoration but everything works thanks in advance for any help. Iwill post pic's s we progress.
Dennis
In Michigan