How to sell my antique ROYAL Typewriters?

I lived in staten island and the guy that owned the house next to mine ped away. he was 89.God bless him. he has the biggest house on our block. his family gave me a few things that he owned and one of them was this typewriter. it's called a ROYAL'' and it kind of resembles a typewriter used during the Vietnam war. please if anyone knows how i can sell this typewriter, or at least a number to get it appraised. thank you i appreciate it.