Seems to be the trend lately

I picked up my grandfathers plane from my dad this weekend. It appears to be a #3 Defiance. It doesnt have Defiance on the handle, just on the iron.

What I was really trying to do was find some info on it, maybe a date ???? Not many markings to go on, there are a few on the castings, but dont know if they would help.

Does anyone have any resources for me to do a little research? It would be more sentimental than anything, although for me ( REAL new to handtools ) its a good practice weapon !!

Thanks for listening.