eBay 1956-58? ES2, 19s, Model 50 petrol tank (also Model 77)

Saw this on ebay:

here is the link: http://www.ebay.co.uk/itm/250989745976?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649#ht_500wt_1287

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