These Kowloon shakers from the restaurant of the same name currently located in Saugas, MA are very rare. In fact some of my friends who live in Massachusetts and collect tiki stuff don't even own these babies.
While searching through Ebay listings I saw an auction for a lot of items and spotted these shakers among the items being sold off together. These shakers are from Johnny Quong's Hawaiian restaurant that was located in Salt Lake City , UT. I believe the restaurant did not serve alcohol but still served "tiki drinks" aka drinks that generally contain rum. How unsastifying!
Lastly although these shakers are not from any specific location they are super rare and seldom seen. They are commonly called "Kelvin" shakers since that is the company that made them.