JETHRO TULL The Whistler (1977 UK 7" vinyl single with intact four prong centre, also includes Strip Cartoon, housed in the rare picture sleeve. The sleeve on this copy has just a little light ringwear whilst the vinyl shows very little evidenceof play. However, that is not all, this example comes in a outer card mailer envelope which postal dated '24.4.77' with the address label on the front printed with the Chrysalis logo)