I had it in my head that my track bike was 26.6; I bought the post and well, it turned out it was 26.8. My silly mistake, your gain.
So, SP-7400 Dura-Ace post, box is crumpled, but it was NOS prior to me sliding it loosely into the frame, it is 'as new' and was manufactured in 1987 by the date stamp.
I'll chase what I paid in £GBP in $AUD; I paid £75GBP so $75AUD will do it.
The Campagnolo post is a silver Victory Reggisella 'Triomphe' item, 26.4. It is used but in excellent condition, it shows some very mild 'zig zag' insertion marks on the lower rear section (below min. insertion mark mostly), comes in tatty original box. I can't imagine it was used on a bike long if at all, I think it may have been fitted and removed from a frameset.
I want $50AUD or swap for a 27.2 Victory Reggisella/Chorus etc post in presentable condition to use on my daily rider.
Its winter and its cold, so I'll go out to my shed and get pics tomorrow.