Value of silver One Crown coins

Can anybody tell me the value of these One Crown coins I have? There are 3 varieties: 1980 Queen Elizabeth 80th birthday, 1980 Nelson, and 1981 Royal Wedding. The obverses are all the same, inscribed with GIBRALTAR ELIZABETH II and the respective dates. I know these are silver, but the ones I have are proof or proof like and have nice album ring toning.

Any advice on value? I picked them up at spot

 

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If Elizabeth II turned 80 in 1980, She'd be 113 this year. I don't think that's right.

 

Coin says: 80th BIRTHDAY OF H.M. QUEEN ELIZABETH THE QUEEN MOTHER .ONE CROWN.

Obverse: 1980 GIBRALTAR ELIZABETH II

thats all I know. The others seem legit from glancing at eBay.

 

It was the Queen Mother's 80th birthday (the mother of Queen Elizabeth) in 1980.

 

The mint state pieces are copper nickel while the proof pieces are silver. They are about 0.8411 troy ounce silver each and I would value them at bullion only.