As you can see I Think it was given to those who helped on the production but were not part of the main Team. It's doesn't feel like just standard A4 Paper And Isn't embossed so I'm thinking it was sent out by the academy awards for studios to complete and give to employees after the awards etc. I Have never seen another certificate to give any more information. But It's a nice thing to have if you collect Oliver!
I Do Know it was My Step Fathers And We Had It Framed On The Wall For Many Years So Does Have A Little Bit Of Discolourisation Due To That And We Often Spoke About The Films He Worked On Whilst At Shepperton Including Half A Sixpence, A Man For All Seasons And Dr Who Invasion Earth And Also A Few Gerry Anderson Projects. If You Have Any Questions Please Ask And I Will Try To Help.