This is a classic provisional surcharge from Luxembourg, applied to the earlier Grand Duchy 1 centime definitive. The bold overprint “LUXEMBOURG / 13” was part of a temporary revaluation process, making these varieties especially interesting to specialists. The underlying design features the crowned national arms within an ornate frame, typical of early 20th-century Luxembourg typography. Such surcharged issues were produced in limited quantities, and differences in type, spacing, and ink intensity make them a rich field for plating and variety study. A solid addition for collectors of European overprints, provisional issues, and fiscal/postal transitions.