Photo Credit: Cambridge University Library
[BBC] The Codex Zacynthius, which dates back to the 6th or 7th Century, has been held in the Cambridge University Library since 1984.
The university has been offered first refusal to buy it and was given until 28 February to raise the funds.
That deadline has now been extended until the end of August.
The Bible Society was presented the 176-page Codex Zacynthius in 1821.
It wants to sell it to aid its fundraising for a new £1m visitor centre inside a deconsecrated church in North Wales.
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