The Pilot Custom K series of pens, released in 1971, consists of three pens, each created to look different but with the same intent. The pens can be found as a stainless steel pen with black chrome stripes running along its body down to the nib (K-500SS), a sterling silver pen with a checkered body (K-1000SS), and a pen created with gorgeous wood from painted maple trees (K-500KS). These different styles of pens were created to give a sense of individuality to each person who bought one, and they continue to live up to their duty today. The Custom series grew to be one of the most popular Pilot fountain pens and has been produced in a variety of styles and finishes. The mechanicl pencil was introduced to the market later in the 1970s.  

- Manufacturer/Model: Pilot Custom
- Year of Manufacture: 1970s
- Color: Silver, black
- Material: Stainless Steel
- Filling System: 0.5 mm lead
- Condition Rank: (B) Very Good
- Country of Manufacture: Japan

Condition Rank Guide:
-N: 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.
-B: 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.
-C: Item is in Good condition. Moderate scratches and scuffs can be seen on the barrel, cap, and/or grip section. No chips or cracks.
-D: Item is in Fair condition. Heavy scratches and scuffs can be seen on the barrel, cap, and/or grip section. May have small chips or cracks. See description.
-F: Item is in Poor condition. Item is not functional. For parts or repair only.