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When did headstock decal get a second line of serial numbers (under the Fender Jazzmaster writing)??

The neck I bought, according to the pictures, has just one line yet according to loads of pictures I'm looking at it should have two??

hi,
according to jim shine:

By fall 1960, the decal has three very small patent numbers added to it.
In very early 1961 the decal had 3 patent numbers added (2,573,254 2,817,261 DES. 186,826). In the fall of 1961 the decal grew to include 5 patent numbers in a slightly larger font.

if you have no patent #'s, you have an original! congrats!