Vintage Rotring Micronorm Drawing Pen Set in Case with Accessories, Spares and Repairs, As Seen

Size of box approx 7 x 4 inches

The box and contents look to be in in very good condition, there is something missing from the main pen but I've never used it or know how it works, sorry to sound so vague, but I'm sure someone will know. The ink is 2/3rds full and still liquid and it comes with the original outer box. Please see pics as they form part of the description. Thank you for looking!🙂