Refillable writing instrument (10) comprising a body (12) and at least one side window (12C), at least one writing element (14) arranged inside the body and comprising a writing tip and a button (13), the button extending radially through the window and making it possible to move the writing element between a retracted position and a writing position, the body comprising at least a first part (12A) and a second part (12B), the window extending between the first part and the second part, the first part being movable relative to the second part, thanks to which the opening of the window is variable between a use opening where the button is at least partly held radially within the body and a refill opening where the button is free to move in the radial direction towards the outside of the body so as to allow the withdrawal of the writing element from the th body.
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