Grade 2 valuation?

[Wild Skies]

An aquaintance owns this 12-ga. Parker Bros. Grade 2 hammergun with 30" damascus barrels that is looking for an approximate value of what it's worth. I told him I'd ask the experts.

All S/N's match. The barrels are in great shape, no dents or pitting, good bores. Some color remains on the frame. Notice the small chunk of metal missing on the backside of the toplever (how did that ever happen?) and engraving missing on the side of the left hammer. The stock checkering is in good condition, but the forend checkering is quite worn. The butt stock is a couple of shades darker than the forend, measures 1 1/2" x 2 3/8" x 14 3/8" to a DHBP, there is no initial shield. In your opinion is this this a refinished or replacement stock? (I wasn't able to pull the trigger guard.)

What's your educated guess of what it's worth? NOTE: If you feel uncomfortable posting a guesstimate on a public forum a PM would work just as well!

TIA,
Greg