As a child we have made a lot of trips with this tug. We sailed through Friesland, the Wadden and Ijselmeer. The name Anema is as you have aspected not right, it has to be Adema and the name Spes was given by the company Krikke from whom my dad had bought the tug in disrespectfull state. The engine, a scania 120 HP was installed by my father as well the PRM gearbox. it was a great tug and brings back a lot of memories when i see the photo's on internet. Although it has lost a lot of iron on the top.
Thanks for the memory!

Ex: 1915 MAASHAVEN, 1953 MAGDA, 1987 SPES, 1988 MAASHAVEN
Registered: (NLD)IVR 23.08422
5 GRT,
Loa.12,05m, B.3,31m, D.1,45m(1,80)
machinery. 1 scr, steam engine by shipbuilder, 75ihp
Re-engined 1936 diesel
Re-engined 19xx diesel Scania-Vabis, 120bhp-88kW

MAASHAVEN
1915: Built by "Machinefabriek & Scheepswerf van P. Smit Jr" at Rotterdam (NLD) (YN 262)
1915: Delivered to (Geelbanders) "Nederlandsche Stoomsleepdienst v/h van Piet Smit Jr" at Rotterdam (NLD) (NLD flag, regd Rotterdam, IVR 23.08422)
1936: re-engined diesel
1953 -20/03: To A. Huisman-Grevelink at Rotterdam (NLD), renamed MAGDA
1987 -xx/12: To Anema at Leeuwarden (NLD), renamed SPES
1988: To W. Bijl et Rotterdam (NLD), as recreation vessel, re-renamed MAASHAVEN
19xx: To "Stichting Buitenmuseum Leuvehaven" at Rotterdam (NLD)
2006: Still in existence

Rgds/immen