Series 25
Continuing on with Tom's link (ya, das ist richtig), assuming the previous owner hasn't changed them, most likely it's an Aqua-Signal Series 25 "Classic". The Series 40 are required for boats over 39 feet.Followed the links and came to some *.pdf files that can be downloaded at http://www.aquasignal.de/aquaeng/shipping/lightonboardnavi.htmlLast year the importance of good running lights was driven home (no pun intended). This was in Dixon Entrance just below the Alaska panhandle. I saw an older sailboat, about 25 foot, that was T-boned by an aluminum sport fishing boat traveling at high speed. The sailboat had small teardrop type running lights that were popular in the early 70's and the lenses were very faded. Larger lights with good lenses may have averted this accident. I had just replaced my bow running lights in-kind but after seeing this accident I would have liked to replace them with the larger Series 40's instead.Recommend using Lanocote on the screw threads that hold the lenses on. Mine "froze" and the screw sheared off hence the need to replace the entire fixture. I also replaced the wires with marine grade tin-plated conductors and coated the interior metal parts with an anti-oxidant to reduce future corrosion. Especially the bulb sockets and wire connections.