By 1955, Gretsch Dynas had black bobbins and plastic covered wire.
Those trapezoid cases were also used on Martin electrics. They're usually wound a little hotter, but they sound the same to me as the others.
The listing on that first link was for just a single pickup. It says neck pickup, which I assume means the short 7/16" housing, but all Gretsch Dynas were neck pickups with short housings.
The DeArmonds on my late '56 6120 and '57 6187 had black bobbins, but still had the white cloth wires.
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