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Dunhill formally instituted a one-year pipe guarantee (the "White Spot Guarantee") and in conjunction with that guarantee a date '''code system to date the pipes in 1921'''. | Dunhill formally instituted a one-year pipe guarantee (the "White Spot Guarantee") and in conjunction with that guarantee a date '''code system to date the pipes in 1921'''. | ||
* The date code is just after the patent number: 1920 +: <u>2</u>, <u>3</u>, <u>4</u>, <u>5</u> or <u>6</u> (they are smaller and underlined). | * The date code is just after the patent number: 1920 +: <span style="font-size:small"><u>2</u>, <u>3</u>, <u>4</u>, <u>5</u> or <u>6</u></span> (they are smaller and underlined). | ||
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