Size: Length - 122mm capped; 141mm posted.
The Hero model 366 is a bit of a mix of style. It has a hooded nib like many Hero pens, made to resemble the parker 51. However, the cap and barrel are shaped and designed just like a Sheaffer pen from the 1950s. The steel cap has a tapered top, and has a polished finish with a chrome plated pocket clip with the "HERO" name imprinted down the stem. There is a further imprint at the cap lip. The barrel, which also tapers at the end, unscrews to reveal a very unusual bulb filling mechanism. I think this was used as it is more compact than the usual Aerometric style filling system that Hero usually use. The nib is made from a steel alloy with an iridium point and is a fine point.