| Date/Name Ship |
1912-04-13 ALFA |
| Manager: |
Klaas Buining, Groningen, Groningen, Netherlands |
| Eigenaar: |
Klaas Buining, Groningen, Groningen, Netherlands |
| Shareholder: |
|
| Homeport / Flag: |
Groningen / Netherlands |
| Callsign: |
NCKP |
| Date/Name Ship |
1920-00-00 ALFA |
| Manager: |
C.A. Soegaard, Aalborg, Denmark |
| Eigenaar: |
C.A. Soegaard, Aalborg, Denmark |
| Shareholder: |
|
| Homeport / Flag: |
Aalborg / Denmark |
| Callsign: |
NCFT |
| Date/Name Ship |
1924-00-00 IRMGARD |
| Manager: |
J. C. & W. Sievers, Breiholz, Germany |
| Eigenaar: |
J. C. & W. Sievers, Breiholz, Germany |
| Shareholder: |
|
| Homeport / Flag: |
Breiholz / Germany |
| Callsign: |
RDKM |
| Date/Name Ship |
1926-07-19 IRMGARD |
| Manager: |
J. C. Sievers, Breiholz, Germany |
| Eigenaar: |
J. C. Sievers, Breiholz, Germany |
| Shareholder: |
|
| Homeport / Flag: |
Neuhof / Germany |
| Callsign: |
RDKM |
| Date/Name Ship |
1927-07-15 IRMGARD |
| Manager: |
Hans Speck, Hamburg, Germany |
| Eigenaar: |
Hans Speck, Hamburg, Germany |
| Shareholder: |
|
| Homeport / Flag: |
Hamburg / Germany |
| Callsign: |
RDKM |
| Additional info: |
In 1934 call sign: DIUV |
| Date/Name Ship |
1950-00-00 IRMGARD |
| Manager: |
Gustav Jurgen Speck, Hamburg, German Federal Republic |
| Eigenaar: |
Gustav Jurgen Speck, Hamburg, German Federal Republic |
| Shareholder: |
|
| Homeport / Flag: |
Hamburg / German Federal Republic |
| Callsign: |
DIUV |
| Date/Name Ship |
1956-01-19 IRMGARD |
| Manager: |
Helmut Beister, Hamburg, German Federal Republic |
| Eigenaar: |
Helmut Beister, Hamburg, German Federal Republic |
| Shareholder: |
|
| Homeport / Flag: |
Hamburg / German Federal Republic |
| Callsign: |
DGRE |
|