Parker 51 vacumatic dating
In the 1930s, Parker came up with an interesting solution.
Cheap fountain pen friendly lined paper from Target.
Half-sheet size (8.5"x5.5") and even my wettest pens can write without bleed through.
These pens came in three basic sizes: standard, small, and oversize.
Canadian production also included a long standard, which is scarce.
US production continued through 1948, and until 1953 in Canada.