[capfel]

Many years ago I worked for Echlin which manufactured and marketed the Accel brand (major component supplier through NAPA).

Back then, I think the Accel plugs were made by Bosch.

But of course, Echlin bought Mr. Gasket, merged with Dana, and was sold to Standard Motor.

Most likely the Accel plugs are made by NGK today. Only the best was sold under the Accel brand and their test labs were excellent.

Chuck