It's worth whatever someone is willing to pay for it!
Percentage increase = 100*(new value-old value)/old value = 100*(72-57)/57 = 100*15/57 = 1500/57 = 26.3 %
The value of 100 year old postcards depends greatly on the subject of the cards and what kind of condition they are in. The value can be anywhere from a few cents up to $100 or even more.
100-400 USD
About 100 dollars
Value is as a wall hanger. Monetary value will most likely not exceed 100 USD if that.
100-400 USD or so
A 100-year-old woman is 100 years old.
10-100 usd
Scythe
scythe
it is 100 year old it is 100 year old