
This is British India 1918 ½A Mumbai Presidency War and Relief Fund, Sindh Women's Branch, Karachi red mauve cinderella (Blatt BFK13) (size: 3.8cm×2.2cm) with perf.13½.
During WW1, the India War and Relief Fund (Mumbai Branch) was created by Freeman Freeman-Thomas (1866–1941), Governor of Mumbai and its Women and Children Branch was created by Governor's wife Marie Adelaide Brassey Freeman-Thomas (1875–1960) for which such labels were issued in booklet and sold at post offices to collect fund from the public and these labels could be used on mail.