The manuscript reservoir is designed to fit the manuscript round hand nibs, it clips or slips on to the underneath of the nib.
Very similar to the Mitchell reservoir.
To tell which is which:- the Manuscript reservoir has a “Star” in it.
The Mitchell reservoir has two holes.
Do NOT fit Manuscript reservoirs onto Mitchell pens. They are sufficiently different in size to strain the nib.
For more information on fitment, of reservoirs please see our guide.