My grandfather passed away last weekend and my father found this article about his mother (my Dad's Mother) with his things. Can anybody tell me what kind of bike this is?

https://i.redd.it/bt27dgn1zci21.jpg via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/aty6r8/my_grandfather_passed_away_last_weekend_and_my/?utm_source=ifttt