Early 20th century Westinghouse spotlight. This massive spotlight bears the Westinghouse logo. All heavy aluminum construction. The lense measures 21” in diameter. It does have a patented arc light but the actual filament is missing. It can be converted to conventional bulb. The lense is plexiglass, but appears to be original or has been on there for a very long time. It came off an old navy vessel many years ago when my grandfather worked at the SF shipyard.