Info On 1947-1948 King SilverStone Trumpet?

Hey I just got my Grandpas old trumpet from when he was in college and ive found ut that its a King silverstone trumpet made in 1947-1948. I need to know if i can get like a instruction manual on like how to clean it and also how to play it if its any different? I also need to know where i can order parts for it because its so far can tell missing the mouth peice not sure if anything else. Thanks guys for helping me i need this help.