Not sure if it's retro, but fillet brazed gooseneck dirt drop stems are definitely a retro thing.
Crust LD 90mm Stem: Fillet Brazed Chrome - 1 1/8" - 31.8mm - Dirt Drop (NEW) | eBay
This is an out of production 90mm steel version of the Crust LD stem. - 90mm length. - 110mm rise. - 1 1/8" Steer tube clamp.
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