Thanks for posting your Hoga. Very characteristic 70's cushion-shaped case and funky colours. It has been interesting to see this era of watch design coming back into vogue with examples from Tudor, Glashutte Original and Zenith.
I don't know much about the Hoga brand, but the Valjoux 7734 cam-controlled chronograph was widely used by various companies including Tudor (the famous Monte Carlo), Breitling, Bulova and Gruen. It's not a pretty movement, but a reliable workhorse.
Hoga (HOrlogerie GArantie) was started by watchmaker Paul Choffat in 1930 with their selling point being water and shock resistance. They were known for their digital display watches (rather than hands), and a quick search of the internet will show many examples. Paul Choffat's son, James, continued the company in the 1940's and Hoga is still producing watches today. But nothing as cool as your chronograph.