For older Johnson outboards (1950s and early 1960s), the serial number is often found on a core plug on the powerhead itself.
Johnson and Evinrude were both made by OMC (Outboard Marine Corporation) and later Bombardier. Their serial number locations are nearly identical. If you cannot find a Johnson serial number, consult Evinrude location guides – they share the same engineering. johnson outboard serial number location
If all else fails, consult a certified marine technician or an online vintage outboard forum with clear photos of your motor. Enthusiasts can often identify the year range by visual features (cowling shape, tiller handle design, shift mechanism) even without a legible serial number. For older Johnson outboards (1950s and early 1960s),
If you are looking at an unknown Johnson outboard, follow this logical order: tiller handle design