Federal Capital Foundation Stone
I hadn't realised its different on three side, I must go back and get the other two sides.
Plaque reads: 'This stone was laid by His Excellency The Right Honourable Sir Thomas Denman Baron. P.C.,CC. M.C.,K.C.V.O.,
Governor General and Commander in-chief of the Commonwealth of Australia on the 12th March 1913'
And Below
'This plaque was unveiled by His His Excellency The Right Honourable Sir Ninian Stephen A.K., G.C.M.G., G.C.V.O., K.B.E. Governor-General of the Commonwealth of Australia on 12 March 1988
To commorate the relocation of this monument'
Submitted by: @IanThorp