Hi,
Here are five examples of the second style of 1946 engine numbers including the number in question CDF3977. This second type of engine number is the one most commonly seen because more 1946 Chiefs were built with this style than the other two styles combined. The distinctive feature of the second series is the presence of 'serifs' or flourishes on the beginning and/or ends of the digit strokes. This style was used from around CDF1001 through CDF5000 (approximately). The number in question; CDF3977 falls into the second series of numbers and it does match the others to a degree where I would say that CDF3977 is a factory original stamping. Note that the '3' has a flat top. The first series also has a flat top, but the third series has a rounded '3'. Also note that the '7' has a short vertical header. The first series and the third series have '7's without the vertical header.
1946 Chief CDF3828.jpg1946 Chief CDF3929.jpg1946 Chief CDF3977.jpg1946 Chief CDF4095.jpg1946 Chief CDF4340.jpg
Here are five examples of the second style of 1946 engine numbers including the number in question CDF3977. This second type of engine number is the one most commonly seen because more 1946 Chiefs were built with this style than the other two styles combined. The distinctive feature of the second series is the presence of 'serifs' or flourishes on the beginning and/or ends of the digit strokes. This style was used from around CDF1001 through CDF5000 (approximately). The number in question; CDF3977 falls into the second series of numbers and it does match the others to a degree where I would say that CDF3977 is a factory original stamping. Note that the '3' has a flat top. The first series also has a flat top, but the third series has a rounded '3'. Also note that the '7' has a short vertical header. The first series and the third series have '7's without the vertical header.
1946 Chief CDF3828.jpg1946 Chief CDF3929.jpg1946 Chief CDF3977.jpg1946 Chief CDF4095.jpg1946 Chief CDF4340.jpg
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