Waterman 56 in Ripple red hard rubber. The 56 was the second-largest of Waterman’s lever-fillers produced in the late-1920s (the largest was the 58), and the Ripple ebonite was unique to the company.
This pen is really nice for regular writing: taller and fatter than the 52/54, with a large #6 nib that’s also the softest, flexiest I’ve ever had the good fortune to own – though I hesitate to call it a “full” flex nib.
Length (capped): 14 cm
Length (uncapped): 13.7 cm
Barrel girth: 1.3 cm