Red leather stamp album, vintage collection

I found a red leather-bound stamp album from the 1950s this afternoon around 2:30pm behind the St. Louis Science Center, near the Forest Park entrance on Education Way. It's about 8 by 6 inches and has a brass clasp that still works, plus a blue ribbon bookmark sticking out. Inside, there are a handful of old stamps with tiny handwritten notes in the margins and a small envelope labeled 'R. Kimura' in pencil. The cover shows gold lettering 'Stamps of the World' with a faded embossing of a palm tree, and the whole thing is a bit worn from years of handling. It looks like someone spent a lot of time collecting, and I can tell it matters to them—if this is yours, message me here and we can arrange a safe return.