"Eire" is Irish for "Ireland".
"Pingin" is Irish for "penny"; 1d is the standard abbreviation for "1 penny". You can see an example of a predecimal Irish penny
here on WorldCoinGallery.
"Leath" (the TH is written as a dot over the T) is Irish for "half" - this second coin is a halfpenny, abbreviated 1/2d.
WCG example.
These coins are from the "barnyard series" of predecimal Irish coins, so called because they all seem to have common farm animals on them (pigs, chickens, rabbits, dogs, horses, etc). The coins are indeed obsolete, now doubly so since Ireland switched to the euro. The dates on your two coins are actually the last years in which those particular coins were struck - the predecimal penny (240 to a pound) was replaced with a smaller, decimal penny in 1971 (100 to a pound), at the same time Britain did. As such, they are both fairly common, even in high grades.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis