Decimal Penny Trial Blank

[F8met 4]

Hello all, still new here so please be gentle!

My Uncle has recently retired from a company which made the machines used to produce the first decimal pennies and two pence coins. He said that during testing they had security guard at the factory with the coin test blanks to make sure none of them went astray. However they forgot to take away a couple of containers of the struck blanks so they all helped themselves to a few. He had a few in his tool box all that time and he re-found them when he was cleaning it out hence the toolbox dirt! He has said he has some 2p blanks as well but I haven't seen them. Are these common? Size and weight of the real coin.

Edited May 3, 2017 by F8met

[PWA 1967 1,840]

I would not have a clue sorry and never seen one before.