Paper Mate Sanford PhD Mechanical Pencil 0.5 mm - Black (Made in Japan)

 
It is a rare New Old Stock (NOS) Item, and no more in production.
 

Product Description:

The Paper Mate PhD line was specifically designed to reduce finger fatigue, and is endorsed by the American Physical Therapy Association. The mechanical pencil tip has shock-absorbing ability to reduce lead breakage, and the pencil features a twist-up eraser for correcting. It has an ergonomic triangular grip that is made of soft, cushioned rubber and is meant for comfort while writing.
 
 

Specification:

Pencil dimensions: Approximately 5.6 inches (14.2 cm) long and 0.6 inches (15.5 mm) in diameter at widest point.

Model Number : SANFORD 67004
Manufacturer: Paper Mate
Body Color: Black
Body Material: Plastic
Clip Material: Metal
Clippable: Yes
Design Style: Ergonomic
Diameter - Grip: 11.8 mm
Diameter - Max: 15.3 mm
Eraser Attached: Yes
Eraser Type: Twist-Up
Grip Color: Black
Grip Material: Rubber
Knurled Grip: No
Lead Grade Indicator: No
Lead Size - Diameter: 0.5 mm
Lead Sleeve Length: 2.2 mm
Sleeve Type: Sliding
Tip Material: Metal
Tip Replaceable: No