The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Happy Day. 9054. E. J. Hey
Many and Happy Returns of the Day. Lilac. Boat. NPG. E. J. Hey. 1913
A very happy Birthday. I wish that on this Natal day I were not quite so far away. E. J. Hey. Greeting Card
Those were the happy days. Inter Art. Dutch Kids. Series No. 320
Those Happy Happy Days. Ludgate. No. 1103
Happy Days. The Henderson Post Cards. Pretty Children. Series K1. No. 2652. James Henderson
Gone are the Happy Days. No. 260. 1919
ManyHappy Returns of the Day. Happy Days. W. and K. Series 343. 1924