Queens fountain pen in Purple Tiffany Casein.
Casein is a material from the famous British pen makers, Conway Stewart.
Founded in 1905 it was eventually wound up in 1975, not being able to compete with ballpoints. Revived in the 1990's but finished in 2014 when it's materials and machinery were sold off.
Titanium Gold with Rhodium accents. Featuring a 23kt Gold plated Bock nib
Uses Universal standard cartridges and supplied with converter.