Silver remembrance spoon, finial a security guard. Indeed the city hallmark of Rotterdam, the year letter O, looking at the shape of the shield, for 1676. The maker's mark is a flying (fluttering) bird (attributed) to Endert Entvogel. Active 1656- 1691. He was born in Denmark around 1623 and married Dirckje van Gladbeeck in Rotterdam on April 18, 1656. He was buried on April 15, 1691.
The other unlear mark is perhaps the provincial lion, standard mark silver 934/000.
Source;
N.I. Schadee Zilverschatten, drie eeuwen Rotterdams zilver, pagina 217 and J.W. Stolk, Goutsmit tot Rotterdam, page 88.