After much encouragement from my older brother (he is an avid doublegun forum man).

I need to ask for assistance. I have recently purchased an older W.W.Greener double gun. I believe it to be a mid to high grade late 1800’s gun that possesses some truly extraordinary engraving of hunt scenes and Damascus barrels.

The grips appear to be missing a diamond shaped insert. I have just mailed the gun off to Keith Kearcher for some minor work and would like to ask him to fill these inlays. I was informed by a gentleman from South Carolina this may have been filled with ivory or buffalo horn.

I have provided a few pictures of the empty diamond shaped inlay; my goal is to identify the original material that should be placed in these carved out spaces? I would truly appreciate any information as to the grade of my shotgun as I have no reference. Thank you, Mike

Greeners higher grade guns often had horn inlays in the stock. The missing diamond in the stock of your gun is not typical of Greeners inlay style.
The gun appears to be similar to their Unique model, grade 35 or 45.[A medium plus quality gun] Greener guns almost always have their grade code engraved on the trigger guard and in some cases also on the fore end iron. If you can provide the serial number it should be possible to establish the date of manufacture and its exact grade.
Will be interested to learn of Keiths evaluation of the gun.