Amglow Batrilite No. 75-C3R 4 pin socket neon

[neondave]

Hi,
          I have info about 'Lighted Survey Buoys'  from 1939 . They talk about the Eveready Luminous Tube operating Unit model A6-80L and the use of the  Amglo bulb mention above.  I have the operating unit ! , but whats the chance of finding and purchasing one of these bulbs ? ?  That would be cool to get these two together.

                                Thanks for any info , Dave