One hopes the auction participants aren't expecting this, because it isn't the only one ... Also, at least three distinct versions of the T160 are known, at least to those possessing Anorak With Fur Trimmed Hood; by the engine/frame number, this is a 'middle' version.
can you elaborate on this a little? I wasn't aware of this, what are the differences?
If, by "elaborate", you mean "it isn't the only one", at least one 'still crated' T160 was mentioned on TOL, and I'm relatively certain there are at least a couple of others.
Otoh, if you mean "the differences", a recent TOL thread
and there have been several others over the years.
Most of the listed changes were made from different engine numbers; however, most people interested in such things identify:-
. Engines before 03356 in March 1975 have the same 1/4" ID oil-tank-to-pump inlet components as T150's. From 03356, NVT started
to upgrade the oil pump and inlet to the larger 5/16" ID - the bigger tank filter, tank-to-engine pipe and stubs were fitted from 03356 ... the holes in the crankcase were enlarged from 04239, oil pump holes enlarged from 04421 ...
. Also up to about 03356, the carbs. have the T150-style throttle-closing spring on the gantry and small springs just to keep the needles in place, incorrectly identified in the TOL post as "6. Early 626/66, 67 have lighter throttle valve springs". It's the carbs. after
this that have a "throttle valve spring" in each carb. - as in Concentrics fitted to twins and singles - but, because three of those standard springs (Amal #622/131) made for a heavy throttle on a triple, each T160 spring (#622/277) was/is lighter.
. Rubber-mounted rider's footrests fitted and front engine mounting changed from about 05500 (iirc) in July 1975. Before, the footrests are bolted to the rear engine plates and the front engine mounting is timing-side plate welded to the front downtube, removeable drive-side plate secured to the front downtube with short bolts into threaded inserts in the downtube. After, both front plates are removeable, secured through the downtube with long bolts. Also, the earlier drive-side front plate has a thin spacer welded on the engine side of the 7/16" ID hole, the later plate doesn't have the spacer ...
So, 'early' before 03356, 'late' have rubber-mounted footrests and later front engine mounting, 'middle' are in between.
You're aware there is really no such thing? It might have a "K" year (second) letter but they were all built between July and early November 1974, when T150 production ceased; the first T160 engines being produced on 14th November 1974. NVT considered the T160 to be 'the' '75 triple.