For anyone needing a replacement bulb for a 3.0V flashing light used in a lighthouse or lens you might want to read the following from a collector that recently had to replace one.
Both Bulb Direct replacements (see attached item) arrived today. Both work as desired – for at least one hour so far. One flashes a little more rapidly than the other, but not objectionably so. When my wife and I compared the illumination of both with that from a non-flashing 2.7 volt replacement (the only one locally available; none could be had marked exactly 3.0 volt), all appear to the eye to be about the same.
The 4.9 volt code 0407-EI ($0.66) from Bulbdirect.com referred to above continues to function after perhaps 8 hours of use.