Your label design with the Royal warrant information on the "Left" would
have covered the years from 1937-1953, under King George V.
The Serial Number would indicates it could be closer to 1937 than 1953,
but White Horse "spring-cap" bottles from 1937-1942 did not have the
Gold Foil-capsule, as this material was needed elsewhere for the war effort.
I can't see all of the Tax Stamp entirely, but if it has a "Series" "111"/"112"
in the center (near the eagles feet) it was taxed in the US after 1944/45.
Your bottle will probably fall into a date range of about 1942-1944...
I have many similar bottles like this, and most were **** to me for about
$200-$250....a few I got for less, but not many.
Walter C Hurst