VLINDERBALG - ENI 03031056- 
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| Name | : | VLINDERBALG |
| Former names | : | Hertog Jan (1988-2008), Altena 5 (1917-1988), Sassenheim 5 (1928-1971) |
| ENI number | : | 03031056 |
| Type | : | Inland Passenger Ship, Cruise ship (daytrips) |
| Built | : | 1928 built as cargo vessel / 1971 converted to passengersship / modernized in 2008 |
| Length | : | 25,9 m |
| Beam | : | 4,7 m |
| Draught | : | - m |
| Speed | : | - knots |
| Capacity | : | 120 passengers |
| Owner | : | Rondvaartbedrijf Lauwersmeer, Anjum - The Netherlands |
| Flag | : | The Netherlands |
| Port of registry | : | Oostmahorn |
