童叟无欺

1. • cheating neither old nor young (idiom) treating youngsters and old folk equally scrupulously
2. • Our house offers sincere treatment to all and fair trade to old and young alike.

Character by character

• 童(tóng)surname Tong
• 叟(sǒu)old gentleman
• 无(wú)not to have
• 欺(qī)take unfair advantage of