| DUFFY, JOHN |
| | Name and vital stats |
| | | DUFFY, JOHN (letterer; production) | NULL |
| | Pen names |
| | | MAC DUFFY; also spelled JOHN DUFFI | NULL |
| | Additional biography |
| | | Amazing Heroes #141, 1988 | NULL |
| | MARVEL COMICS |
| | | Support (prod/let/) 1963-68 | > 63 64 65 66 67 68 |
| | SEABOARD COMICS |
| | | Support (let/) 1975 | > 75 |