Queens fountain pen in Celeste 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.
Rhodium with Gold Titanium accents.
Featuring a Bock size 5 nib
Supplied with k5 convertor and also takes a universal cartridge