Hello!
https://en.numista.com/catalogue/index.php?e=oeco&r=&st=1-2-148&cat=y&im1=&im2=&ru=&ie=&no=&v=&cu=&a=&dg=&i=&b=&m=&f=&t=&t2=&w=&mt=&u=&c=&wi=&sw=&o=v
It should be 1950:
International Monetary Fund Library:
https://www.elibrary.imf.org/display/book/9781557758941/ch02.xml
(Box 2)
Bank of England:
https://www.bankofengland.co.uk/-/media/boe/files/quarterly-bulletin/1962/currency-and-banking-developments-in-certain-commonwealth-countries-during-the-past-ten-years.pdf
(Page 25)
It would seem the British West Indies Dollar was initiated in 1949 by the British government and the Currency Board set up in 1950 to administer the new dollar.
The first notes were issued in November 1950
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