Active: 1977 – 1986
Founded by Bob Seidelmann, a sailmaker and champion one-design sailer in a number of classes. The factory was located in Berlin NJ, USA. The Seidelmann line ranged from 24-37 feet, mostly of Seidelmanns own design.
| Name | LOA (ft) | First Built | Last Built | Rig |
|---|---|---|---|---|
| CHESAPEAKE 30 | 29.92 | 1977 | — | Masthead Sloop |
| SEIDELMANN 24 | 24.18 | 1981 | — | Fractional Sloop |
| SEIDELMANN 245 | 24.18 | 1981 | 1984 | Fractional Sloop |
| SEIDELMANN 25 | 24.6 | 1977 | — | Masthead Sloop |
| SEIDELMANN 295 | 29.42 | 1982 | 1986 | Masthead Sloop |
| SEIDELMANN 299 | 29.92 | 1979 | 1981 | Masthead Sloop |
| SEIDELMANN 30 | 29.83 | 1977 | — | Masthead Sloop |
| SEIDELMANN 30-T | 29.92 | 1979 | — | Masthead Sloop |
| SEIDELMANN 34 | 34 | 1981 | — | Masthead Sloop |
| SEIDELMANN 37 | 36.83 | 1980 | — | Masthead Sloop |
| SONAR | 23 | 1980 | — | Fractional Sloop |