Strawberry diamond was a very popular motif right up through the mid-19th C, so I'd be hesitant to place your piece necessarily that early. In fact, I was kind of surprised to see a possible date of 1810 in the book, as I usually associate patterns without such fine cutting that early. Although yours does bear a strong resemblance to the piece on pg. 45, it's not quite the same, so that isn't particularly helpful.
Strawberry diamond was so widespread (at least in America and England; I don't know about Ireland) that I imagine you might have to find the shape in a reference somewhere to actually get a positive ID.
Mmmm, offal! Doesn't it just make your mouth water?