Hi JMC and all with interests in the Hull orphanage/s.
JMC I found the SS Sea Horse, she's included in a book "A ships in Focus Fleet History' compiled by Arthur Credland (Curator of Hull Town Docks Museum) and Richard Greenwood. No photo unfortunately, but I copied the details for you:
Iron schooner-rigged steamer. O.N. 56135 Launched 1867 by Tod & McGregor, Glasgow, 60HP. 1868 Registered in the ownership of the Countess of Cardigan, Deane Park, Northamptonshire as SEA HORSE. 1873 sold to Sir Henry Edwards, Ashbourne, Derbyshire. 28/3/1881 Registered in the ownership of Walter S Bailey, Hull. 1883 sold to Prince di Sirignano, Parigi, Italy and renamed RONDINE. 1892 Omitted from Lloyds Register of yachts.
Like everyone hoping to get more info on the orphanage/s when the archives are opened. Regards KiwiJane