Bought these two used for $35 each not knowing if they worked. I cleaned them up and they're my new favorites! Parker Sonnet and (I think) Waterman Expert. : r/fountainpens
Waterman Hemisphere Essential Matte Black Chrome Trim Fountain Pen Medium Nib-Montgomery Pens Fountain Pen Store 212 420 1312
Parker vs Waterman | WatchUSeek Watch Forums
Waterman Hemisphere Deluxe Cracked Marble Fountain Pen Medium Fountain