"a Yuletide card, bearing on it a pictorial representation of a parasitic plant, the legend Mizpah, the date Xmas 1892, the name of the senders: from Mr & Mrs M. Comerford," (U17.1780)

from Wikipedia: Mizpah is an emotional bond between people who are separated physically or by death. Mizpah jewellery is worn to signify this bond and the word 'mizpah' can be found on headstones in cemeteries and on other memorials. From Genesis 31: 'And Mizpah; for he said, The Lord watch between me and thee, when we are absent one from another.'