Vintage Antique? L & N.E.R Mailpost 'snail' whistle With Chain and Hook Made by 'J. Hudson' of Birmingham, and listed as 'The Acme Thunderer'. Stamped to one sied L & N.E.R, with "Mailpost" to the other side, also stamped "The Acme Thunderer" and "Made in England". Chain is in great order withl hook on one end. Great condition and fully working, with some signs of age and usage. Length: 2 1/4" (5.7cm) Chain: 35cm Inc hook Posted via Ebay simple delivery Royal mail tracked and insured.