Afinely made tie should have very even
and straight sewing with a smooth
second cover.
The tie should  be very straight especially the 33 cm
area of the wide end of the tie.
Fold two ends of the tie
respectively to see whether they can inosculate
perfectly.On the obverse of the tie,there should
be a middle sewing line just above the inverse
"V",which can keep the shape of the tie.if your
tie confirms with all the above,you have got a very
good tie.