#191 is correct.
Could you give us an enlargement of the left stamp? It might help better identify what's going on.
That said, the line could possibly be what's called a doctor/ductor blade flaw. The engraved printing plate is essentially scraped to get rid of excess ink but stopped or hopped to produce that line. It is not a constant flaw and can happen anywhere on a stamp; I would consider it interesting but minor. Doctor blade flaws discussed here: http://goscf.com/t/51424
The white spots are also probably inconstant. It may be due to storage with a stamp on top having its gum sticking to the face of this and pulling ink off when separated; that's damage. It could also be ink peel when the ink dried too fast in those spots and did not stick to the paper during printing.
The more significant thing is the ink spots in "LA". This might possibly be a constant variety and thus worthy of mention in some reference and possibly worth a very small premium; it might be inconstant. Stay tuned, someone may have the answer to that.