Speedy Letter Service 1971 Postal Strike labels used on two covers & mint block

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Speedy Letter Service 1971 Postal Strike labels used on two covers & mint block:
$53.22

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Speedy Letter Service 1971 Postal Strike labels used on two covers & unmounted mint corner block in fine condition

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Speedy Letter Service 1971 Postal Strike labels used on two covers & mint block:
$53.22