Parker. Parker 51 Aerometric Fountain Pen A Parker 51 Aerometric fountain pen in blue, a colour that complements the model's clean, purposeful appearance. Widely regarded as one of the most influential fountain pens of the twentieth century, the Parker 51 represented a major departure from traditional pen design upon its introduction and quickly became a favourite among professionals, academics and public figures worldwide. The pen features the model's distinctive hooded nib and reliable Aerometric filling system, innovations that contributed significantly to its reputation for durability and ease of use. More than seven decades after its introduction, the Parker 51 remains a benchmark of practical design and engineering excellence. The rich blue finish provides an attractive alternative to the more commonly encountered black examples, enhancing the model's visual appeal while preserving its unmistakable silhouette. Model: Parker 51 Aerometric Type: Fountain pen Colour: Blue Filling system: Aerometric filler Condition: Good Vintage Condition Accompanied by: Original Parker presentation box. Shipping: Shipped worldwide with tracking.