At the end of the day it's a 30 to 40 year old boat as all Normans now are so any prospective buyer will buy on condition not whether it's a Mk 1,2 or 3 so I wouldn't loose sleep over it
The Mark 1 23 did have ally frames and also had various handrails. I had one! Lots of things vary as they were always sold at various states of completion. Also folk often confuse the 22's and 23's which is no surprise as they are virtually the same length.
well all i can say is look at my norman 23 which i know for a fact is a mk3...all i'm trying to say is if you get your facts right people might be more interested....ebay mo 321853019770