What does it measure???? Most those old ponies used a 7/8 in. dia. x 18 tpi x 5/8 in. reach spark plug (originally a Champion #1 Commercial) current replacement is a Autolite #3076 (same as Model A Ford).
If it's really early it may be possible to run into tapered pipe thread spark plugs.
Thanks OM! I'm a step closer now. My pony turns but no spark so checking my mag is next.
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