You weigh whatever originally came with it, otherwise explicitly say what is not there or what has changed.
e.g.
Syncros Cattleprod 1991 1-1/8" 135mm Zero Rise
281g
with Ti bolt replacements (name if known) 273g
with no bolt 250g
So basically up to you just be as detailed as possible.
Years can be important, for instance in the syncros stems, as they changed design's yearly etc..
Steerer tube lengths on forks add weight so worth mentioning that.
Also worth mentioning the seatpost diameter and length, again year if known as they too would change but be under the same name.
If you don't know, then no harm in posting a small picture
Though 'gump' is the moderator here so I guess ask him.