When Esterbrook went from making Dollar Pens to J-model pens, it ran out of Dollar Pen caps and opted to use the new J-model caps on the remaining Dollar Pen barrels. It is difficult to tell the original ones from the repairmen who replaced broken Dollar Pen caps with J-caps. We found this pen this way, but that doesn't mean anything. What is interesting is the top jewel on the cap has 3 lines instead of the usual concentric circles. The color match is pretty close to perfect between the cap and barrel. We restored the pen with a new ink sac. You will this upgraded steel 9461 nib that is firm and very smooth as it writes a fine line. No cracks, deep imprint, some wear from use. 12.4cm capped.