Perhaps some others might have more information, but this says it is a souvenir postcard. It is addressed to the International Womens' Bureau in Switzerland in 1914. This was an international welfare organization that looked into missing persons, especially women and their families, who lived in either invaded lands or enemy lands. If you were to have the message side translated I would guess it would be some kind of inquiry into seeking help in finding out what happened to someone or their family after an area was conquered by the opposing army.
In general, WW 1 postcards are of modest value unless they have interesting cachets or other markings on them beyond a simple postmark on an ordinary postage stamp. For example, if this were a card from a soldier in a military unit, having that military unit's rubber stamp cachet would be a plus, and if it were from a famous person or a famous military unit it would be more. The reason they are of modest value is that there were millions of postcards of all kinds being sent throughout the war.
Unless someone sees something more than I am seeing, and unless there is something very historical on one or more of the group of 100 of these beyond the one that you illustrate my thought is that the lot of them might go for something in the range of $1 to $2 each if you can find the right buyer which is not always easy to do. Cards with more interesting markings tend to go in the $3 to $5 range, or ones with really interesting markings can go for $5 to $25 each.
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