thanx S(uper)-Man !
first, my opinion was : HSS cannot be a S540, so it is a 540S !
and I saw this in the '92 catalog (thanks Rich

) :
we can see we have here a "TB" finish
I have a S1540 FMTT that have a "sunburst", from green to dark blue
(turquoise)
but......... anyway....... waiting for the axe, and will try to make some nice pics,
so the enigma would be solved !