Always a bit difficult to date classic gentlemens' items but I would say 1950s or 1960s judging by the quality of the fabric and the style of the label.
Measurements:
The total length of it including elastic is just over 34"
The total length of the fabric component is 23"
The depth of the cummerbund at its deepest point (centre front) is 4.5"
The elastic is adjustable.
Have any questions?
Contact the shop owner.






