Vol423, in my system of valuation, Francotte is Brand Value level three (BV3), the Knockabout is a minimally engraved BLE which fits to Original Quality grade seven (OQ7). Current Condition level sounds like "significant use" to "heavy use but no abuse," which is CC3 to CC4.
BV3-OQ7-CC3 = $1,620 and BV3-OQ7-CC4 = $1,233. Note that ODW and I agree rather closely. Should the "in the hand" gun condition better match "Limited use - slight finish wear, little shooting," then, BV3-OQ7-CC2 = $2,165. As you can see, current condition is a powerful determinant of value. Note: value does not equal price; price is the final number agreed to by both buyer and seller.
Hope this helps.
DDA