Here is a NEW old stock NIKON LAMP 6 VOLT 30 WATT PART NUMBER 77904.  These bulbs were made by Hosobush and are marked  6V  30W  and are all new old stock, NO boxes but will be carefully packed.  The bulbs measure 25MM diam at the base and are about 55MM overall size. The Hosobush part number is OP-2118 but they are not marked.  Bulb is used on many Nikon and Olympus microscope models.

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