“It don’t signify to you with your brilliant lookout, but as to myself, my guiding-star always is, ‘Get hold of portable property’.”
– Charles Dickens
Great Expectations, Chapter 24. Wemmick is not a rich man and doesn’t have “great expectations” like Pip, so he is always looking for ways to make money. So he collects small valuable items like jewelry that can easily be converted into cash. A man careful with money, he calls these his “portable property.”