MI by creed. Sounds laughable, but I just applied some and I swear I had thought I rubbed MI on my nose or applied somewhere on accident. They aren't the same scent, but Matterhorn did remind me of MI for an odd reason or another. Maybe its just me .
Never tried it, but it wouldn't surprise me if Old Spice looked to something like MI or more likely, MI smell-alike Unforgivable as their inspiration.