1995 Celebrating Medical Science 'Error' of Layout gutter strips of 10 (5x2) ACSC #1881ze and zh, matched pair with both being Sheet C with 'HEIDELBERG CPC' in the gutters between stamps 3 & 4, Cat $1500. [The appearance of these items proved that Australia Post was using a special printing of just gutter blocks for its packaged 'product'.]

Grade A A1 (Image1)

Estimate AU$750