NST has always stood for "Norwegian Split Toe" to me...
no idea why they are referred to as a Tanker which is a name typically associated with a clunky Military style boot
I believe the term "Tanker" comes from Lakota House, which created the Tanker boot with Alden in the mid-1990s. The original Tanker boot was designed on the 379X last (which they still offer today, style nos. 4540H and 4545H (#8 and Black)). Lakota House calls the 379X last the "Military" last because it is reminiscent of military boot lasts. They named the "Norwegian Front" boot the "Tanker" because of the military last. I may be somewhat off on some of these details, if so I think Adam @Alden of Carmel can correct me.
I think these days the divide between an NST boot and a Tanker is pretty artificial, but I tend to refer to Tankers as being exclusively on the Trubalance, Barrie, and 379X lasts, whereas the Aberdeen and Plaza boots I tend to refer to as NST boots due to their more elegant lasts.
Just a quick hello and share of my current favorite - and second pair of - Aldens (first one are classic color #8 parajumper boots)
They go as Alden should equally well over raw denim and classic pants. Very pleased by the comfort they provide and the versatility of this model. As I'm not a tall person I have to say they fit me better than boots.
Salesman told me it was a cigar calf on an "old british officer shoes design".
The numbers in my shoes says model is M3407.
... Yes I went a bit crazy and took both the Alden brush and cordovan shoe horn !
I'm using Alden neutral "fine boot cream" on them. If you think this is not good please advise.
Any input on this model (history, specificities) will be appreciated as I haven't seen many infos.