Is This Yt:fr 730e, An Error, Or Nothing At All?

Hi guys,

I'm new to this world, so I apologize in advance if this is a waste of time to anyone.

I have a French stamp. Yt:FR 730. But it has something different on its right border:


It looks like some of the green ink used for the stamp. Here's a closer look:


And an even closer one, just for fun:


And here is the back of the stamp:


Against the light:


By now, some of you experts might be chuckling and saying: "that's just a [insert jargon term here]" . But, just in case, I'm sharing this.

I looked at Yvert & Teller's Catalogue, and the only variation that could be close to a description of this is the Yt:FR 730e, which says "grosse tache de couleur" (big splash of color?)

But I'm not sure that that's a good description for this "stain" (for lack of a better word).

So, the question holds: Is this Yt:FR 730e, an Error, or Nothing at all?


Thank you all very much in advance.

Best to all,

Eric

It is a stray ink blob. A freak, not an error.

Maury doesn't seem to recognize the Y&T "e" variety. I'd be curious to see a confirmed example of the type.