Robert Oster Thunderstorm Signature Ink Size:4ml(Sample) A freestyle weekly diary that

A freestyle weekly diary that allows you to plan for 27 weeks (approximately 6 months)

Elastic closure and ribbon bookmark for convenience

With its smooth rollerball tip

travel-friendly design for everyday carry✅ Perfect for collectors

Flexible Pockets Ample room for your essentials—carry only what you need

Robert Oster Thunderstorm Signature Ink Size:4ml(Sample) A freestyle weekly diary thatRobert Oster Thunderstorm Signature Ink is a dark blue grey ink that captures a moody, stormy sky kind of feel rather than a bright or clean blue. It is made by Robert Oster, a brand known for inks that often lean into shading, complexity, and natural variation on paper. On writing, it appears as a deep blue black with strong grey influence. In finer nibs it can look almost charcoal or near black, while wetter writing reveals more of its blue