Ink sac sizes for the Parker Lucky Curve and Jack Knife Fountain Pens
| NIB SIZE | PEN LENGTH (Closed) | STYLE | INK SAC SIZE |
|---|---|---|---|
| Number 2 | 3 5/8" | Ring | 17 1/2 x 1 11/16 inch (N) |
| Number 2 | 4 3/8" | Ring | 17 1/2 x 2 1/8 inch (N) |
| Number 3 | 4 3/8" | Clip | 19 x 2 1/8 inch (N) |
| Number 4 | 4 5/8 | Clip | Size 20 Straight |
| Number 5 | 5 1/8 | Clip | 21 x 3 1/4 inch (N) |
| NIB SIZE | DESCRITION | MODEL NUMBERS | INK SAC SIZE |
| Number 2 | Min Metal Pen | Unknown | Size 15 Straight |
| Number 2 | Hard Rubber, Medium Length | 20, 20 1/2 S Jack Knife | 17 1/2 x 2 inch Necked |
| Number 3 | Metal Overlay. Medium Length | 32 Jack Knife | Size 16 Straight |
| Number 3 | Metal Overlay. Full Length. | 14, 90, 91, 92 Jack Knife | Size 16 Straight |
| Number 4 | Hard Rubber Medium Length. | 24, 24 1/2 S, Jack Knife | Size 19 x 2 1/8 inch Necked |
| Number 5 | Hard Rubber. Medium length | 25, 25 1/2 S, Jack Knife | Size 21 x 2 inch Necked |
| Number 6 | Hard Rubber. Medium Length | 26, 26 1/2 S, Jack Knife | Size 21 x 2 inch Necked |
| Number 8 | Hard Rubber. Full Length | 28, 28 1/2 S. Jack Knife | Size 23 x 2 1/2 inch Necked |
