The Irish knives and tools have not really attracted much collector attention, and remain good values. Originally intended for the European market, I believe, they were some decent products for the price points. Tangstamps on quite a few patterns underwent some changes when they decided to begin U.S. imports of them, and perhaps even before. ISC IRELAND STAINLESS is seen from time to time, as are several others you mentioned. My little TM23 is marked Imperial Ireland Stainless, which is a lot to get on such a small tang! Retailing for $8.95 in 2000, it beat the heck out of similar knives from China. I first see the Irish products appearing in the 1990 catalog with the introduction of the Imperial Apex series, eleven patterns in all. The Tradesman series and Trophy series were added in 1991, listing nine more patterns. I'm not sure just when the Diamond Edge and Jackmasters began being made there, but they were. The Apex WIlderness series came out in 1996, and the Tradesman tool line expanded in 1999. They were always listed in the literature as Imperial until 2002 when the Schrade International logo appeared, so maybe there is a clue for us. The Jackmaster line was still listed as Imperial until the end, but in 2004, the Apex and Tradesman series were called Schrade.