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Can't tell from picture if it is flat or has a slight bevel. If it does have a slight bevel it looks like Bella #580191 "Bentaglio"... 1 1/2" across and 1" deep. Bamboo Slant.
Nope... now that I look again the grain is a bit different.
It's not slanted, just straight across . . . cross section is a rectangle.
Hmmm. Bella. I don't have a catalog for them and their website is cumbersome. The one I'm trying to match has the exact same measurements as their Tango line, which I stumbled across: http://www.bellamoulding.com/moulding/tango.htm
but the finish is incorrect.
Looks to me like an Designer Moulding line that has been gone for some time. You might want to reach out to them and see if it is theirs. If so, there were other companies that bought large amounts of their stuff and distributed them. Maybe they can direct you to someone who is holding some.