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The mark is a capital "C" then a smaller capital "N" over a dot then a capital"B" and then smaller capiyals "RS" over a dot. (CN Brothers?) Thank you for taking the time to look at this.

Hello,

Chapman Brothers of Alfred Works, 25 Burgess Street, Sheffield registered the mark on 13th February 1902.

Mike

Thank you! What a joy it is to receive such speedy and knowledgeable information.