1910 | Belgium 5 Centimes (Dutch Language)

Yep, Belgium 5 centimes 1910. Looks like this, I assume?

The "weird long design" is the monogram of the king, Albert I - an ornate letter "A".

Belgium is a bilingual country (French and Dutch), and in the past has issued two separate coinage series simultaneously, identical in design but with the different languages. Your coin is the "Dutch variety". The "French variety" looks like this.

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The back is upside down to the front?

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That's perfectly normal for this type. Some countries have their coins "upside down" like that. The technical term is "orientation of the die axes". Australian coins have "medal orientation" with parallel axes ^^. Your coin has "coin orientation" with opposing axes ^v.

Several hundred years ago, virtually all coins were made with "coin orientation", hence it's name. Now that most of Europe has switched to using the "medal-oriented" euro, the United States is one of the last remaining countries that still produces upside down "coin orientation" coins.

Not particularly scarce or valuable. This was the currency used in Belgium during WWI; many of the soldiers who fought in that theatre of war brought home some Belgian coins, so they're often found in dealer's "20 cents each" scratchtrays.

The type is listed in the Krause catalogue as number 67, with 1910 catalogued at 35¢ in VF condition.