The item had belonged to John Richardson who helped save 700 Titanic passengers in April 1912.
The collection includes a celluloid frame from 1952 film Pluto's Party, signed by Walt Disney.
The item was awarded to John Richardson for his efforts in rescuing survivors of the 1912 disaster.
Research is underway to uncover the identity of two teenagers in 17th Century portrait.
The letter was written when Princess Elizabeth would have been between 10 and 12 years old.
The letter from Queen Elizabeth II asks if "the birds are well, and the goldfish haven't died".
The machine will once again be used at the Toy Museum at Penshurst Place and Gardens in Kent.
Gardens in Arundel, Pensworth and Tenterden are on a shortlist of eight for a national award.
The restoration was made possible by a £100,000 grant from The National Lottery Heritage Fund.
