Here some interesting error or defective coins .

[HAXall 0]

Good day and Hello to all! i've found some coins,do they worth anything?and what happend to 5 pence coin?is it just a corrosion or something else?(one side shiny but other not,and all detales are visible and not damaged)

[Hussulo 6]

Good day and Hello to all! i've found some coins,do they worth anything?and what happend to 5 pence coin?is it just a corrosion or something else?(one side shiny but other not,and all detales are visible and not damaged)

Hi HAXall,

Your picture is slightly blurry but it looks like either toning or a poor metal mixture of the planchet.

[Gary 7]

could have been reverse side down on a damp surface for a long time.........

[Peckris 579]

Good day and Hello to all! i've found some coins,do they worth anything?and what happend to 5 pence coin?is it just a corrosion or something else?(one side shiny but other not,and all detales are visible and not damaged)

It's not dated 1973 by any chance? It looks like the worst fate that happened to that year's proofs (I had a set with the 5p and 10p just like that, and had to sell 'em off real cheap).