UPDATE: Cousin Anje was able to track down a Ducth newspaper clip that said Johan graduated from Gooisch Higher Citzens School in Bussum in 1943, indicating that this is a school photo. She posted more details in the comments.
ORIGINAL POST: This photo almost could be filed under Mystery Photo Series on this blog. It includes my grandfather Johan “Hans” Siersema (fourth in from the right), but I have no idea who the other people in the photo are. The writing on the back says only G.H.B.S. Google searches brought up a hockey club called Gemeentelijke Hogere Burger School for those initials, and hockey is fairly important in my family. My opa played in an adult league after immigrating to Canada and my uncle said he thought my opa broke a couple ribs playing. However, this club is in Groningen and to my knowledge, Hans didn’t spend any time there. If anyone else has ideas, I’d love to hear them.