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• These are Four antique Robert Bosch A-G Zd Automobile Spark Plugs.
• Most of them have the following marked on 5 of the 6 sides: Bosch, Robert Bosch A-G, Germany, Zd, Importe D’Allemagne.
• All spark plugs have these measurements:
• Threads - about 11 mm diameter
• About 41 mm tall
• One spark plug is in the original box.
• they all appear to be very good condition.

Please see all 13 photos for more details. Please contact us with any questions.

The package weighs 10 ounces, and measures 7 x 5 x 3 inches.
We take great care in packing our items.