Up for immediate purchase is this rare circa 1929 AC 18mm Spark Plug set of Two. 

The boxes are date printed 1929 (29), and are a scarce checkerboard dark Blue, White, Orange and Yellow graphics. These are for Racing Outboard Motors with High Comp. Pistons, and as a result the side electrode is a side pin design. The 'G' designation were 18mm, and the 2-1/2 is a very cold heat range with a '1' being the coldest. AC 1934 issue chart shows these were OEM on Johnson, & Caille Model 35A, and recommended for the ELTO Model 460, 1933 'Super C'  Midget Racer. Evinrude 'Racing Speedtwin' 1929-'31 also show as recommended.

The boxes are complete with no end flaps missing, or repaired...No writing, No tape! The original Copper & Asbestos 18mm Gaskets are included. 

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