I'm pretty sure I've seen those before. I've been collecting bottles for over 20 years, but mostly poison and some apothecary. This is modern, as in early 1900's (well, modern as far as antique bottles are concerned) and is a molded bottle, not a BIMAL bottle. It used a screw cap, not a cork as the opening isn't perfectly round. This is a lamp oil bottle, most likely from the 10's or 20's. The notch allowed you to line up the bottle while filling the lamp correctly so that the non-round spout allowed it to "burp" while pouring without shooting oil everywhere.
HTH,
-Bill