Hi welcome to the forum, all your answers can be found on the internet.
Dutch Z I mark (925) mark for used objects and/or import, which are submitted in finished condition, which consequently could then not be assayed as thoroughly
http://www.925-1000.com/forum/viewtopic.php?f=5&t=32028
Of Equestrian Interest; A silver limited edition model of a horse
by
Lorne McKean for John Pinches (JP in oval), London 1975 on behalf of The British Horse Society
Entitled "Play Up", cast model of a rearing horse, mounted on an ebonised stand, height 11.5cm, weight 19oz, cased with certificate, and silver model of a horse, by
G.S. Nell for FM (Franklin Mint), London 1977, Silver Jubilee mark, depicting a horse cantering, mounted on an ebonised stand, height 8cm, weight 20.5oz. (2)
Footnotes
Lorne McKean (born 1939) was a student at the Royal Academy Schools and won the Leverhume Scholarship, the Silver medal for sculpture combined with architecture, and the Feodora Gleichen Scholarship. She was elected a Member of the Society of Portrait Sculptors in 1969 and a Fellow of the Royal Society of British Sculptors in 1972, she was the official B.T. artist for the London 2012 Olympic Games. She sculpted HRH Prince Philip on his polo pony, which was the Queen's personal Silver Wedding gift for her husband.
http://lornemckean.com/about/
Best,
Oel.
(gratitude contribution Silverly)