Source: EN-EM (1915) Ad:

Our Guarantee:
All goods sold by us are guaranteed to be as represented.
Our purpose is to supply you with the best of everything in our line at the lowest possible cost.
Not How Cheap     But How Good
We want your trade solely upon the merits of our goods.
If any of the goods should be spoiled, or of inferior quality, please advise us of the fact at our office and do not discontinue buying without an explanation.
Yours for business,