Early hawkens had a square cheek rest like on an early Penn. or Kentucky rifle, especially if it were a fullstock or flint halfstock. Later rifles had a rounded cheek rest known as a "beavertail" like found on some 1850 -1880 sporting rifles. Nearly all percusion halfstocks had the rounded type. TOW has plans for the hawken rifle ($5.50) that show the rounded style and describe the squared one for very early Hawkens. Check their catalog for help on the "sideplate" (actually just a washer for the lock bolt) the shape changes over time and depending on flint or percusion. also note the trigger guard and triggers are different on early and later styled Hawkens. Bairds book will be of some help as will the pictures in TOW catalog or their website. The butplate is also slightly wider and not as curved on the early hawkens. The sources mentioned above are all good