Brand: Prisman (name appears on metal base), made in Germany.
Item: Vintage Christian devotional glow lamp / light bulb featuring a cross-shaped internal element.
Design: Clear glass bulb with tapered sides and domed top, containing a metal cross that would appear illuminated when the bulb is in use.
Material: Glass bulb with metal screw base and internal metal cross insert.
Markings: Base is stamped "100-110V" with additional small codes along the rim and "OS A PRISMAN" above "MADE IN GERMANY".
30's Glow Lamp - Used during religious ceremonies to remind Christians to live in the light of Christ.
Style: Early electric Christian devotional accent for altar, shrine, or religious lighting display and collectible.
Condition: Vintage bulb with age and wear. Scattered dark spots, and loss to white coating near base; glass shows no cracks or chips. Metal screw base has tarnish, oxidation, corrosion spots, and a bent extended bottom contact spring. Base wiggles on glass. Bulb is tested. Takes a while to heat up and level out.