The stamps refer to amounts of premium in dinar for accident insurance that could line up with a company stamp (cancel) for a travel agency.
Evropsko Osiguranje of Belgrade. Probably needless to add Belgrade in Serbia and Zagreb in Croatia both were in Yugoslavia.
A theory might be that the stamp was proof of payment for travel-accident insurance with a 10,000 dinar coverage taken out for a trip booked with, or car hired (the example posted by vayolene has a distance added) from the travel agency.
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