Are you sure it's a pineapple? I have seen thistles depicted with cross-hatched marks on the center portion in a similar way.

Thistles are often associated with good luck in Scotland.

I have a brass letter opener which waa given to me as a gift by my mother upon returning from Scotland. One could easily mistake the large thistle for a pineapple. Especially so, when the thistle is depicted in its unpicked state, where it hasnt opened. The body of it is detailed with cross-hatched marks.

NDG