Dark green horn? I haven't seen any offerings like that. I'm looking at just a couple of horn choices to start out, light brown and dark brown probably. Did you perhaps mean a dark green Mother of Pearl suit button?
Stunning MOP buttons, SP. I commissioned a navy suit recently and have been looking for thick, solid dark brown/black buffalo horn buttons. I ended up picking up a number of dark brown buttons with medium brown speckling from a local shop. Interested in solid dark brown/black buttons (something like the BT 2) for a dark grey suit and topcoat so let me know if you can source a matching set and other details--sizes, thickness, (un)polished.
I sent you a PM on ordering the MOP AK and Standard.