Postmark Stroke Association 2015 on Window Envelope - Beatles 64p 2007 stamp

A used 64p " The Beatles Help " stamp on a  window envelope postmarked  " Royal Mail Mount Pleasant Mail Centre "  dated  2015 (see 2 scans).

Cancel slogan " Royal Mail proud to support Stroke association ". 

Condition: Clean example, opened neatly (not torn) partly at the top, along the left-side plus c.30mm along bottom-left.

Flap neatly sealed down with selotape at the back.

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