Keystone wardrobe trunk (P&H)

Hello all. I have had this trunk sitting in my barn for 10 years, but before that, my mother had it for storage in her home. I need to know it's history. I believe my father, a military man, travelled with it. The covering is cracked in some places and the wood beneath looks to be made of oak maybe. The writing says Keystone trunk company with the letters R & H in middle. I hope this is enough information to identify it. I tried search engines on web, but couldn't find anything. Thanks