In the catalogues, a block of four or more is usually priced at 4 times (or however many stamps are in the block) the value of a single stamp plus at least one more stamp's value.
Example: If a single stamp was valued at $1.20 then a block of four would be valued at $1.20 x 4 = $4.80 + $1.20 = $6.00 .
The rarer the stamp the higher the pricing goes for any type of multiple. For recent or common stamp the value would probably not exceed the plus one formula.
For a large sheet perhaps it might be No.of stamps x value of single x 10 to 25%. Demand is always a large deciding factor. Could be only worth face value or less also. Higher value stamps are of course rarer as not so many are printed so would probably not fall within that consideration.
But Christmas stamps are printed in large quantities (or, at least, they used to be) and perhaps would bnot have a large premium added to the face value or single stamp value.
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