Traveler's Company - Traveler's Notebook Refill - 002.
The paper used for this refill is called MD Paper, which makes the ink hard to stain and sink through to the other side, so it works very well with fountain pens as well.
MD White Grid (5mm x 5mm) Paper. 64 Pages.
Approximate Measurements: 210mm x 115mm.
Made in Japan.
Product Code: 14246-006