I guess you think the third digit is a number 3.
Back in 73 the number sometimes came on the seat tube under the seat bolt and could be tricky to read.
Top tube cable routing like that the braze ons for the cables on the downtube near the head tube do not say 1973 to me.
Have you a pic of the frame number ?
There's a write up on how to set up brake levers properly for that era, the bloke who does all the Raleigh SBDU stuff.
In the very expensive campagnolo toolkit BITD there was a special tool to do brake lever position....looked very much like a long ruler lol
I'll have a look for the link...
Downtube decal looks wrong, the I under the E is too far to the left plus the angles don’t look cotrect
There’s a thread here on retro bike somewhere about the decals.
Also a bit too red, by this time the paint fades to a more pink colour.
Or maybe the cynic in me ?