These 1975 Christmas stamps don't indicate the price per stamp, as

The 10 Most Valuable U.S. Stamps

1975 CHRISTMAS MADONNA #1579 Plate Block of 12 x 10 cents US Postage Stamps : Toys & Games

USA - 1975 Christmas Stamps

1579 - 1975 10c Traditional Christmas: Madonna and Child - Mystic Stamp Company

The stamp is of The Madonna. And to the right of her head is the year 1975.

Authentic U S Postage Stamp 1975 Christmas

1975 Christmas Stamp

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Why do we need stamps? - Quora

1975 COMPLETE MINT SET OF POSTAGE STAMPS ISSUED IN THE YEAR 1975 BY THE U.S. POST OFFICE DEPT (34 Stamps Total) : Toys & Games