@Darren Holt No-one is sure what the “O”, or other letters that used, stands for. May 1957 is correct. Tony
Hi @Darren Holt .. Yes, May '57 No one knows for certain.. Some sort of production numbers? .. Another 'Tilley-ism' ! Looks like your tank/fount is the last of the good ones, before the base plate was inverted (Whoops! crossed with Tony)
@podbros I am having a little giggle here about your base plate comment: Buy a x246b everyone says the x246a was much better. Buy a x246a and everyone says ooh the guardsman was better. Buy a guardsman and you better get the base plate the right way round... I think it is a conspiracy just not sure what sort yet...