Certain flaws will help to identify this Type:
Seal #36: a blue dot above the "1" of "19"
Seals #76 and 77: a green dot above and right of the cross
Seal #88: the cross is broken at the top
Seal #95: the cross is square at the top.
Type 2: The dots in the red shading are arranged in horizontal rows.
Type 3: Same as Type 1, but without the heavy red line between the top two rows of bricks. The red line is not always obvious; if measured accurately, the different perforation gauge may be a more reliable test.
Certain flaws will help to identify this Type:
Seals #1, 10, 47 and 92: the cross is square at the bottom
Seal #44: a blue dash between the "H" and "Y" of "HEALTHY"
Seal #49: a dent in the cross at top left
Seal #51: the lower arm of the cross is broken or pointed at the left
Greens Catalog of the Tuberculosis Seals of the World,, Part 1, U.S. Christmas Seals, 2014 ed., p. 21
