There are experts who will have more to say but 'boardroom' is a good model in terms of quality.
I am unsure of the tags but I would guess this is definitely not too recent by the black with white lettering and needle.
There might be a thread with HF tag info in the forum if you search.
Anyway, I will take a guess that people will say it is too expensive from the few times anyone asks about a used suit.
If it is in great condition and it fits you well, you will live with the price. Do I think it could not be cheaper? Sure it could but so can everything, no?
What is a fair price? I don't know...50 seems very low to me for something in very good condition so take it from there.
Not sure if this one will but I believe most 'boardroom' models have it printed on the tag found inside the inner pocket.
Ask for that if you like.