VTG General Electric (GE) \"Mazda\" C9 (or C9.5) Swirl Flame Christmas light bulbs For Sale

This is a Lot of 10 assorted color bulbs. ALL have been tested with a Multi-Meter / Continuity Tester and test GOOD !!
These are vintage General Electric (GE) \"Mazda Style\" C9 (or C9.5) swirl flame Christmas light bulbs, highly collectible holiday decorations primarily manufactured between the 1930s and early 1950s.• The \"Mazda\" Trademark: These are \"Mazda Style\" and the brand name was a licensing trademark used by GE for high-quality tungsten filament lamps. GE phased out the Mazda name around 1945, which dates the bulbs featuring that specific stamp to the pre-1945 era. Bulbs stamped with just \"G-E\" typically date from the late 1940s into the 1950s.
• Design & Coating: These bulbs feature a distinct, heavily sculpted swirl or flame shape. Based on the rich, solid appearance of the blue and white bulbs, these are interior-coated glass envelopes. Interior coating protected the colored paint from scratching or weathering compared to older exterior-painted versions.
• Sizing: The intermediate brass screw base and large size identify them as C9 size bulbs, which were traditionally used for outdoor stringers, rooflines, and large indoor trees because they project much further than smaller C6 or C7 lighting.
• Material Composition: They utilize solid brass bases, which indicates they were produced before 1951 (at which point manufacturers transitioned to cheaper aluminum bases due to wartime material