I purchased my first Sportscaster cards from the set originating in Finland. It was quite a nice start as I picked up both Steve Prefontaine cards.
So far I've gotten cards from the USA, UK and Sweden sets. Those three all have specific codes that identify the country of original sale. These cards from Finland don't have a specific number code. The cards are identified by their pack (deck) number and a cumulative card number in the entire set.
A USA card might be 19-05 but this card is 19-440. The card on the right is from set 40 so it is numbered 40-948.
It seems like all of the other sets have the identifying code. Here are some nice details (http://www.atlaspicturecards.com/Sportscaster_cards.html).