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*The encircled group number was introduced in 1951 (see [[#Notes|notes 1]]). | *The encircled group number was introduced in 1951 (see [[#Notes|notes 1]]). | ||
*In 1952 full-size stamps were added to the finishes, right after the circled groups (see [[#Notes|notes 2]]). | *In 1952 full-size stamps were added to the finishes, right after the circled groups (see [[#Notes|notes 2]]). | ||
* From 1952 up to 1954, stamped SHELL BRIAR (without quotation marks and the possessive). | |||
* On sandblasted pipes, stamped DUNHILL SHELL (without quotation marks and the possessive). | |||
*In 1953 the finishes stamps after the circled group were reduced to about half the size (see [[#Notes|notes 3]]). | *In 1953 the finishes stamps after the circled group were reduced to about half the size (see [[#Notes|notes 3]]). | ||
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==== BREV. No. 491232/18 ==== | ==== BREV. No. 491232/18 ==== | ||