According to AMO-Standards 2000
one 'X' behind a given number indicates a draw weight being actualy 2-3# havier then stated on the bow.
Example:
35x@28" could be an actual weight of either
37# or 38#@28"
At this time (01:30 a.m.) I've no answer to the 'X's in front, but I think the one X - one pound astimation is not correct ...
I know, I do have this explained somewhere in one of my many books ...
The number behind the sideplate - yeah - that one will be right on! And the differences can sometimes be enormous:
I own a 1975th Super Kodiak wich is marked 70# - but under the sideplate it is only 64# - and thats what I measured! There must have been a shortage in already ordered 70# bows - otherwise I cant see any reason for being that much off