While this might seem of litle interest to most of you. it is particular to British collectors who bought pence stamped copies of American comics.
Fortunately, Adam Eterno and Get Marwood & I, both members on comicsuk.co.uk, Have dug up some info. Adam informs us:-
"I?ve asked around and the best answer I?ve found was from the one and only Steve Holland who suggests ? Might be Roberts & Vinter, who were book distributors in the 1960s. They became publishers ? of Hank Janson, New Worlds SF magazine and Compact Books ? and probably had a finger in many other pies, like distributing comics.? which sounds pretty reasonable to me"
And Get Marwood & I notes:-
"I've found quite a few references now to Roberts & Vinter online, and connections to both Thorpe & Porter and Gold Star. The timings fit, so it seems highly likely that the stamps I posted above are theirs. There is a rarer 'RW' variation of the stamp towards the end of the run and, lo and behold, a David Warburton seemed to be a Roberts & Vinter person - perhaps his W replaced Vinter's V? I'm hoping to find a smoking gun example that definitively ties the shield stamp to them, perhaps on or inside one of their other know distributed publications - fingers crossed...."
There you are. A curiosity perhaps but it piqued my interest.