The lucky shamrock medallion is obtained like other random loot when doing jobs.
It's a defense item with 1 attack and 7 defense.
by doing jobs
(20.09.09) Clip the Irish Mob's Local Enforcer under Soldier Job Tab
bust a made man out of prison
clip the Irish mob's enforcer...soldier level
Clip the Irish Mob's Local Enforcer 9 energy required Soldier (lvls 9 - 12)
In the soldier tier you do the "Clip the Irish Mob" job. It is a dropped item.
u fight other mafias
You have to get lucky with the Daily Lotto.
It is a random drop - but seems to be a higher probability on "Clip the Irish Mob's Local Enforcer" in the Soldier tier. You will have to do the job a few times since it is random, but I got quite a few of them when I was working on the Boxing collection.
It is one of the achievements you earn in the st. Patrick day special!
You Get the item from clip the Irish mobs local enforcer on soldier teir.