Schin—I tested with Engrosser's and to a lesser extent also with OP. Regardless of that, I tried to keep the body of my observations limited to qualities of the nibs, so as not to be script specific. Where I am more general, what I say should be considered with both scripts in mind. E.g. when finding a nib to be poor, I'm saying I don't like it for either.
Anasazi—showing writing samples would make the whole process much longer and hugely more work. It's hard enough for me to produce one sample I'm willing to share, let alone one per nib!
By quirks in this context I refer to unusual behaviours that might make the nib harder to use. For the Spencerian No. 1 and the nibs I note as taking after it, my main use of the term is to refer to the unreliable hairlines with thin inks.
Heebs—I was not aware of the different versions of the Spencerian No. 1, thank you for enlightening me. The pen I tested for the review was just stamped "New York", and unfortunately, so are most of the rest. None are stamped with "England", but I will do a test of a "Made in England" nib. If I find it notably different, I will update the original post with a contrasting review.
Faeleia—I'm very interested to try a 356; there's a high chance it'll become a favourite if its hairlines are really that good.
To all expressing thanks, you're welcome—it was my pleasure (and that's not just an expression).
