You will need to contact the owner's representative to arrange access.
In the case of this object this can be done by:
Writing to Mr James Carleton at Farrer & Co, 66 Lincolns Inn Fields, London, Wc2a 3lh
Reporting A Data Error:
Reporting An Access Error to the HMRC:
A circular honestone portrait of a gentleman wearing a doublet and holding gloves in right hand
Maker:  Maker Unknown
Description: 
A circular honestone portrait of a gentleman wearing a doublet and holding gloves in right hand, inscribed 'Jacobus Philipus Adlerr, MDLIII', German, 16th century
ID:  78625