The complete set in detail

FT056
SG D433
1926 - Recouvrement, inscription 'valeurs impayées' - overprinted '50 c' on 10 cts. violet

FT057
SG D434
1926 - Recouvrement, inscription 'valeurs impayées' - overprinted '60 c' on 1 cts. olive

FT058
SG D435
1926 - Recouvrement, inscription 'valeurs impayées' - overprinted '1 F.' on 60 cts. red

FT059
SG D436
1926 - Recouvrement, inscription 'valeurs impayées' - overprinted '2 F.' on 60 cts. red