Recently I had the huge pleasure of visiting a private collection, with many such plaques. It had been mostly assembled before the days of the internet, when it was possible to attend a small auction and bid unchallenged on magnificent items. (Or at least, that is how I choose to imagine it, as it belongs firmly to the era before I started collecting.)
Many of the plaques were hung high up, so these are the best photos I could manage. I have added more plaques to the Plaques with hand-painted text page and Poetic verses page, amongst others.