What is the estimated value of a Sheridan Model A Air Rifle in mint condition?

The highest value for this rifle is $1,400 and that's for Excellent. you can add 15% if it is a first production. Without serial number, Sheridan engraved on the side, felt lining in the forearm cocking handle and another 60% for the owners manual and box. This model was made from 1947 to 1953 it was made in .20 cal and a few in .22 cal. Apx 2,130 were made