I find this piece interesting because my suspicion is that the cloisonne work is actually Chinese, possibly done during the 1930s-40s decades of Japanese occupation.

This amber or topaz enamel overlaying a colored first layer doesn't seem to show up in Chinese cloisonne before the 1930s. [Follow the link to the blog post on the topic.] Could it perhaps have been a Japanese introduction?

Jamey's research and published sources from the early 1900s make it pretty clear that Japanese entrepreneurs had established glass factories in China around the time of the end of the Qing Empire. Why not cloisonne ateliers as well?

The mon makes me wonder if it was a commissioned piece, not something produced in the 1970s to appeal to the Japanese businessman or tourist visiting Hong Kong?

What mon is this, btw? I have some vague recollection that it's a famous one... A MINUTE AND A HALF LATER: Wikipedia to the rescue. It's the Tokugawa mon.

http://en.wikipedia.org/wiki/Mon_(emblem)