This is a very nice half mile Ray copper spotlight. My guess would be late 40s to early 50s on some sort of a cabin cruiser Chris-Craft style boat. Would be a larger seafaring boat. Function has not been tested so I don't know if it works or not. The item "Vintage Half Mile Ray Marine Light 433 The Portable Light Company Unrestored" is in sale since Saturday, November 17, 2018.
This item is in the category "eBay Motors\Parts & Accessories\Boat Parts\Electrical & Lighting". The seller is "evap82" and is located in San Andreas, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Bahamas, China.