Post '84 1911

Anyone have info on post'84 Colts. I have a Gold Cup National Match. It has a stainless slide and frame. Serial # SN01xxxE. Curious as to what the E designates as well as the upside down delta with a P in the center and F on the left side front of the trigger guard and the W on the right side same location. I realize they are proofmarks but wondering if anyone has any further information. Also does the serial # being in the first 2000 make any difference in the value. Thanks.