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Often as little as 250 Irish pressings were made, if they sold out then either another 250 pressings were made, or a few hundred UK pressings were imported. 

 

So if you went into a record shop in Ireland, (for example looking for Evil Woman), you might get an Irish copy if you were lucky, or a UK issue or sometimes the Irish & UK pressings were mixed together.

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The Harvest issues should have been sold in EMI company sleeves, but Ireland didn't always receive large enough sleeve quantities from EMI in Hayes. 

 

The Polydor pressings should have been issued in Polydor company sleeve's.

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As with most Irish pressings in the 1970's, the United Artists and Jet Records pressings were sold in plain white sleeves, occasionally a Jet Records company sleeve might have been used.

 

Post 1981 Irish issued singles usually had their company sleeves (but not always!).

 

The Irish record pressing plant in Dublin pressed 7" singles with a 4 prong push out rough centre section, these became known as "lunar" or "moon surface" centres as they are said to resemble the Moon's surface !

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Credit to John Walsh for above info.