Zenith tv channel indicator

[old_coot88]

You can use a #47 or #44, but the projected image will be smeared/blurry.
The required bulb has the filament configured to provide a point source of light.
It has a designation number consisting of four digits, something like 1829 (that's not the number, but something similar) and danged if I can remember it. Somebody on here surely remembers it.