For the guy who is looking for a replacement bulb for his Bell flashlight:
Here are the specs for the original #27 bulb:
#27 Miniature Bulb E10 Base - 4.9 Volt .3 Amp 1.47 Watt
G4-1/2 Miniature Screw (E10) Base, 1.4 MSCP, C-2R Filament Design,
1.06" (26.90mm) Maximum Overall Length (M.O.L.),
0.55" (14mm) Maximum Outer Diameter (M.O.D.),
0.72" (18.30mm) Light Center Length (L.C.L.). 30 Average Rated Hours.
I bought some LED replacements on eBay for vintage 2 cell (3V) flashlights.
I've used both 0.5W and 1W ones with very good results.
You could try the 4 cell (6V) replacements from the same seller.
They have the correct E10 screw base, and the 1W ones I have seem to have about the same LCL ('light center length') as your original incandescent bulb.
Both the 0.5W and 1W LED versions will be brighter than the original bulb.
They are very inexpensive, but ship from China, so take 2-3 weeks to get to the US.
https://www.ebay.com/itm/LED-Upgrad...hash=item1c94a6572f:m:mZGyR0bFMkAwbbVcHd1pUrA