Look for an aluminum tag--or a silver or white adhesive label. The model number may be printed or stamped onto the tag and it may be written in two different type sizes or styles.
Gas & Electric
With door open, mounted to cabinet door frame.
On left or right side of dryer near the bottom of the cabinet.
On back of dryer near the top.
Combo
Inside the dryer door, on the door frame.
On the top of the dryer.
On the side of the washer, near the bottom, front.
Under the washer lid.