Well, this presents as an interesting item. Here is what I discovered: Bottom line is that I believe you have found an uncommon and exciting oddity, but I'd hesitate to use the descriptive uncataloged (just because I am not sure and hardly a BNAPs expert). I hope this information is of help, humbly given with great respect.
First off, it is # 94 (Lithographed) or #89 for those with an NSSC catalog. The John Guy Issues are notorious for errors and is the principal reason for the engraved re-issue in 1911; people complained in 1910 because of the errors. there is the #87 of course with JAMRS, NFW etc. Others also referred to in Unitrade, like "Mcsquito" for #93 to name another.
But no mention of errors with the 94.
There is a mention though in Bogg's history of Newfoundland Stamps on page 82 about the many flaws and transfer varieties, so I would conclude its cool but not uncatalogued.
I also pulled from the safe, my best copies and found three mint versions that appear to have the same flaw--one to a degree more than the others. the N morphs to be an S.
Check them out. I've tried to scale up the best example but not perhaps failed to enable zoom in on the web site here. Under my magnifying glass, I think that perhaps this small error appears in many of the stamps. I just never noticed. Perhaps others also just never looked that closely.
So, its a great topic, and as you touched upon it probably exists fairly robustly, but you have an extreme example. which would make sense for lithographed stamps.

