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Here's another Kempson's Birmingham Buildings halfpenny Conder token.

I'm afraid it's just a metal detector find that has been cleaned, either with a barrelling machine or some sort of dilute acid like vinegar or citric acid. As Jelida says just above, cupro-nickel coins out of the ground have a coppery tone when cleaned - I know, having been an active detectorist for years!! This is because the nickel leaches out into the ground a little, being slightly ferrous in its chemistry, leaving a higher percentage of copper remaining, especially on the coin's surface. Additionally, 20p's are struck in 84% copper and 16% nickel whilst, before they went clad steel, other denominations were struck 75:25 copper to nickel, so there's more copper to start with! Sorry, but it's just worth 20p!

I have spoken to Michael Gouby re this coin and he is 100% sure that it is an inverted A. He says : "The centre "A" bar is clear and solid. A tiny bit of the 'foot' of the inverted A can be seen just above the left leg of the 'V'. The 'I' of VIC has also been double struck. I am lucky enough to have taken an enhanced scan of the whole of the word VICTORIA. Richard, if you want to post this picture or my comments on the Pre Decimal website – feel free to do so. I am sorry that I don't seem to have time be active on the forum but I am always willing to help with any question that I can answer. Here is Michael's photo:

Here is an email (sent 06/04/2018) I received from the Royal Mint Museum; "Dear Mr AardHawk Please accept my apologies for the delay in response to your most recent email. Having reviewed the Annual Reports for the period in question, there were approximately 6,164,050 ‘Britain’s First Decimal Coins’ sets released by banks and post offices, with the coins for the sets being struck between 1968 and 1970. The reports we have seem to suggest that the 5p and 10p pieces included in these sets were only dated 1968 as this is the year that the coins were introduced into circulation as legal tender. However, there were 888,000 sets issued in 1969 and we can confirm that some of these did contain 5p and 10p pieces dated 1969. Unfortunately, we are not be able to say how many sets as the Annual Reports we have do not separate out the numbers for the sets. Kind regards Fiona Fiona Trumper Public Engagement & Information Officer" My own research shows that there are at least two different minor varieties of 2p, Reverses Aa and Ab.