Discovered in Keswick, near Norwich, the disc "is an unusual find for the Roman period", said a Norwich Castle Museum spokesman.
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The Castle Piccadilly scheme would deliver a 400, 000 sq ft (37, 161 sq m) shopping centre in the city centre adjacent to the Coppergate Centre and Castle Museum.
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The trust wants to keep the castle, museum and library open to the public.
David Pickavance, from Penrhyn Castle Railway Museum, said there was a big difference between a museum engine and a working one.
The house is one of the Dali triad that includes the Dali Theatre-Museum in Figueres and the Gala Dali Castle-House Museum in Pubol, but Portlligat is where the famous Surrealist lived from 1930 to 1982 and where he created works like The Madonna of Portlligat.
Initial fundraising allowed the trust to buy the castle in December 2008, and it began planning how to develop the existing museum and the castle.
For a better sense of the town's history we ambled up a steep lane to Vimperk Castle, home of the local museum.
The museum housed in this fortified castle of the colonial period is dedicated to the study of navigation, underwater archaeology and maritime history.
First opened as a museum in 1997, the castle initially displayed the van der Grinten collection in a cluttered manner recalling the brothers' own home.
Mr. Hecher, his wife, his adult son and his son's girlfriend all live on the castle grounds, where they also have a museum and restaurant.
Other suggested uses for Kinloch Castle include a hostel, hotel or for use as a larger museum.
The Black Watch Museum Trust has plans to transform the base at Balhousie Castle, Perth, approved last month.
The view of Dudley Top Church appears a number of times and a sketch of Castle Mill Basin looking towards Tipton is of particular significance, the museum said.
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Relations between Mr Mountney and the council deteriorated and on 12 February 1912, as the council was planning a new museum for the town, council workmen arrived at the castle and removed the exhibits.
The famed Hearst Castle, for example, may be better maintained by an outside operator such as the Getty Museum, the report suggested.
Other items are currently on display at the Potteries Museum and Art Gallery, in Stoke-on-Trent, Lichfield Cathedral and Tamworth Castle.
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