From innovative company TWSBI is their new Diamond 580 clear demonstrator fountain pen. A piston-filler fountain pen (traditionally found on more expensive fountain pens) in a modern design - all capable of being disassembled and reassembled by the user!
This fountain pen comes with all the necessary items you need except ink!
The Diamond 50 inkwell is the perfect compliment to the 580 fountain pen.
From the manufacturer:
A quick no brainer guide in choosing nib sizes in an overly complicated fountain pen world:
If you write small, go with an EF
For the normal writer, F is the most popular
If you tend to lean on a bigger font, M will be perfect
B is for statements!! Sign a check in B, write a header in B, do some coloring/shading in B
Stub nibs are italic in writing style (have a special card or invitation to write?)