Worth about £1.71 as a proof. 85,704 were minted, the 37th lowest of any proof 1p.
37th/ 40
Its proof mintage of 85,704 is the 37th lowest of 40 proof 1p coins in the catalogue.

£0.09
Mintage 658,142,000
1989 1p Elizabeth II (non-magnetic)

£1.71
Mintage 77,569
1989 1p Elizabeth II BU (non-magnetic)

£1.71
Mintage 85,704
1989 1p Elizabeth II Proof (non-magnetic) (this page)
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