Last week I bought myself a date stamp and 15 May 2014 I started stamping the backs of my ATCs as I finish them... It should help keep track of when I finish each one. On the front I sign and put the year, but it helps to know the actual date sometimes. It would have been helpful for the first two in my post yesterday.
67Cat; Pen, Prismacolor Colored Pencils
69Dog; Pen, Staedtler Watercolor Pencils; 15 May 2014
70Cat; Pen, Staedtler Watercolor Pencils; 15 May 2014