About 1908, based on the style of the card and "Printed in Bavaria" on the back.
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Caption: Royal Yacht Club Harbour, Lowestoft
After 1914, post card publishers stopped using German printing houses to make their cards and often emphasized "Made in Britain" on the back. Since this card had the new Yacht Club building in it (built in 1903) and "Printed in Bavaria" on the back, I can easily place it between 1903 and 1914, and so split the difference when I make my date estimate.