Lot 70441 – 1973 Machin undenominated proofs produced during commissioning of the Jumelle press, tête-bêche gutter block of eight

1973 Machin undenominated proofs produced during commissioning of the Jumelle press, tête-bêche gutter block of eight with four in light violet (colour of 5p) and four in dark violet, one pair creased, very fine and unusual.