Citizen AH37901-0 (AH379010) compatible black ribbon.

High quality compatible ribbon.

Not manufactured by Citizen:

GSX-130 (GSX130)

GSX-140 (GSX140)

GSX-140+ (GSX140+)

GSX-220/CT (GSX220/CT)

GSX-230 (GSX230)

GSX-240 (GSX240)

GSX-340 (GSX340)

GSX-540 (GSX540)