Lovley piece Bill, Henks right buffalo horn varies in colour & often even within same horn, the redish, blonde, yellowish & green shades are much rarer & getting even more so today due to modern Indian & Philipeane farming methods. {genetic seltion, antibiotics, food additives & killed at an early age.}
Ive hade many kukri handles that were yellow or green on one side & black on the other. { as well as all green, all yellow etc.]
Often they are sold as rhino on kukri , pesh, Jambiya & Indonesian weapons,...... Buyer beware.... Still no Cities paperwork needed!
A horn importer told me that about 1 in 1000 Indian buffalo horn is blonde, I dont know whether thats right, its seems an approximate I guess, but it certanly seems like it from all ive seen..
Pre. 1930s colour variation seemed much commoner, from what I can see.
Spiral