Pfaff 3119 Instruction Manual page 37

Sewing
After selecting a variable or special program, a program key can be reserved by
pressing one of the 3 program keys longer (about 2 seconds).
In addition, previously selected cut lengths, variable or special programs can be
+
selected with the corresponding plus/minus key (also see Chapter 11.06
Selecting programs).
-
Selected programs are marked on the display with an " * ".
1500: Piece counter / reverse counter
Depending on the activated function (piece counter or reverse counter) the
number of buttonholes already sewn or the number still to be sewn is displayed.
10 - 2