Hi Ian,
George Street was a bit of a mess, what with some ½ nos, duplicate nos (eg 167 & 168),
and some buildings not even having a number - some gaps in the nos. too.
--
Starting on LH side of George St going west from the corner with Causeyside Street.
1 remained 1
2 became 3
3 became 5
3½ became 7
4 became 9
5 became 11
6 became 13
- and so on to -
84 became 193 (now last no. on LH side)
- cross over to right side of street -
85 became 190 (now last no. on RH side)
- and so on back to beginning of the RH side of George St at the other corner with Causeyside St.
166 became 10
167 became 8
167 became 6
168 became 4
168 became 2
--
So the 6 you viewed was originally a 167.... across from it are new houses; the old originals are, alas, now all gone.
I did that myself before i knew of the number changes. Gazing at 78 where many of my own lived & died,
then finding out later that i should've been wistfuly looking at 175.... which was a 100yds away on the
other side of the street.

Jack
ps, the moral i suppose being that if you have an address in Paisley for great granny before 1923,
and intend to visit it, then best call at the Reference Library first to check if the no. has changed.
Otherwise you
might just end up staring at the wrong place altogether....