The 1918-D Lincoln cent is common in circulated grades and widely available in the Brown and Red-Brown grades well into the Gem range. The 1918-D is notorious for some soft strikes, caused by worn dies being used beyond their normal operating lifespan. So, be choosy on the purchase and avoid examples that exhibit weak strikes or other issues. As always, pieces with decent color and strong strike will provide more satisfaction to the eye and possibly yield a better return on investment when the time comes to sell.