Coins with rim devices

[<k>]

Guyana, 1 cent, 1974.  Birds form rather large rim devices here.

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Indonesia, 5 rupiah, 1974.  A rather strangely shaped star(?) as a rim device.

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Indonesia, 10 sen, 1951.  Small flowers.

What is the main shape here on the coin, on which the denomination sits? There are two unusual mint marks too, just below the denomination.

[<k>]

Indonesia, 50 sen, 1961.  The rim flowers are rather differently shaped on this coin.

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Falkland Islands, 2 pounds, 2014. 

The devices on the rim look like representations of explosions.

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Argentina, 1 peso, 1996.  UNICEF commemorative.  Children's faces.

[Figleaf]

What is the main shape here on the coin, on which the denomination sits?

I think it is a fruit of the fertile brain of the designer, Prof. Van Hengel (see below). It reminds me of similar geometric devices used on banknotes as a safety device.

There are two unusual mint marks too, just below the denomination.

They are actually quite usual ... on Dutch coins. The caduceus used to be the mark of the Utrecht mint and the fish is the mark of mint master Van Hengel. Hengel is angling rod; you get one chance to guess why he chose the fish.

Peter

[<k>]

Thank you, Figleaf.