Aside from denominations and design, the condition and stamp grade of the postage stamps are critical factors to consider in appraising the value of a stamp. The grade and condition can affect the overall valuation of the stamps, and help you build a world-class collection. In philately, the postage grade refers to the presence and quality of centering, the presence of cancellations, and the condition on the other hand focuses on the ‘actual damages’ including color fading, stains and alterations.