M_Boats: Monty 23

I am currently in the process of purchasing a 1980 Monty 23 after a long search. Can anyone tell me accurately how many of these Jerry made? I have heard numbers like 20 or so, but the two 23's I have looked at have hull numbers in the 70's and 80's. Also, any ideas where I can get a replacement centerboard pivot pin? Thanks, Sean