During the 80’ties, the SA issued some special “Carols at Christmas” covers. I’ve seen carols at Christmas covers up to 1993, see 1987 cover on the right. In the 90’ties , the practice discontinued and the use of the Salvation Army meter mark seems to have substituted it. The below Christmas FDC was issued in 2001, the latest date with Christmas Meter mark I’ve seen up to now.