In 1964, Pilot introduced its first Capless push-button system fountain pen. It had one of the most complex mechanisms that Pilot had ever produced. It was named "Knock-shiki" which means "push-knob system." The Knock-shiki system was released with several Capless fountain pens. This particular pen is the C300SW. It was offered in Black, Red, and Green, and it featured stainless steel trim. 

The Pilot Capless is unique in the sense that it has a retractable nib unit system. With the push of a button, the nib is extended and ready to write. Similar to a ballpoint pen. The mechanism has been serviced to ensure proper functionality.

- Manufacturer/Model: Pilot Capless C-300SW
- Year of Manufacture: September, 1965
- Color: Black, Silver
- Material: Resin, Metal
- Nib: 14K Gold Fine
- Filling System: Pilot Proprietary Cartridge/Converter
- Condition Rank: (B) Good Condition. Please see photos and condition rank guide.
- Country of Manufacture: Japan

Condition Rank Guide:
-NOS: Item is in New Old Stock condition (NOS). Shows little to no signs of use apart from some minor handling wear.
-A+: Item is in Excellent condition. Micro-scratches can be seen on the barrel, cap, and/or grip section. No noticeable scuffs, chips, or cracks.
-A: Item is in Very Good condition. Minor scratches and scuffs can be seen on the barrel, cap, and/or grip section. No Chips or cracks.
-B: Item is in Good condition. Moderate scratches and scuffs can be seen on the barrel, cap, and/or grip section. No Chips or cracks.
-C: Item is in Fair condition. Heavy scratches and scuffs can be seen on the barrel, cap, and/or grip section. Cracks or chips that potentially affect functionality may be present. See Photos.
-D: Item is in Unrestored condition. Item is good cosmetic condition, but not functional as-is. Requires repair or to be used as parts. No returns on items labeled with this rank.
-F: Item is in Poor condition. Item is broken beyond reasonable repair and should only be purchased for parts. No returns on items labeled with this rank.