| Manufacturing date | .Oct 1955. | .Nov 1937. |
| Length (mm) | 21.7 | 22.7 |
| Width (mm) | 5.3 | 5.8 |
| Feed diameter (mm) | 5.0 | 5.0 |
| Weight (g) | 0.2 - 0.3 | 0.3 |
Dimensions of two Pilot nibs of size 1.
Nib made on November of 1937. "WARRANTED / "PILOT" / 14 K / MADE IN JAPAN / -<1>- / HARDEST / IRIDIUM".
Nib made on October of 1955. "WARRANTED / PILOT / 14 K / -<1>- / MADE IN / JAPAN".
There are some obvious differences between these two units made 18 years apart. And the feed diameter seems even smaller than that of the size 0 nib described some days ago.
The engravings of these two nibs are very similar, but this detail changes with the manufacturing date, as we will see along this series of texts
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