I have a 1982 but the only place I have seen any reference to hull number is on 
the name plate attached to the cockpit wall next to the tiller. C-27 and 5053 
is all it reads. There are no numbers that I can find on the transom on mine. 
If it wasn't for the registration I wouldn't know the HIN.

--- In [email protected], "Michael" <mlong9...@...> wrote:
>
> 
> How to Read the Hull ID Number
> There appears to be four numbering schemes in use.  Dates for the transition 
> from one scheme to the next might be off plus or minus a year, but I believe 
> it looks something like this: 
> 
> 1971 - 1973, No HIN, just a metal plate at the transom (inside cockpit) 
> 1973 - 1975, No letters for month built (e.g. CTYL16231074) 
> 1975 - 1984, a mysterious "M" is a part of all HIN's (e.g.CTYH9353M80C) 
> 1984 - present, Year built represented with a number (e.g. CTYH5390F697) 
> Model Year.  For the boating industry, the new model year starts in August.  
> Since 1975, the Month Built information has been represented with a letter.  
> In 1984 the lettering scheme was changed to make "A" represent the month of 
> January.  Here's a look at the two schemes:
> 
> 1975 - 1984 Jan = F Feb = G Mar = H Apr = I May = J Jun = K 
>   Jul = L Aug = A Sep = B Oct = C Nov = D Dec = E 
>               
> 1984 - present Jan = A Feb = B Mar = C Apr = D May = E Jun = F 
>   Jul = G Aug = H Sep = I Oct = J Nov = K Dec = L 
> 
> The Model Year scheme in use between 1975 and 1984 derived the Year Built 
> information from the Model Year and from the Month Built.  For example, a 
> boat whose last three letters of the HIN were 82A would actually be a 1982 
> model year Catalina 27 built in August of 1981.  Here's three HIN's decoded:
> 
> CTYL06121172    A Catalina 27 built in 1972. Sail number 0612. 
> CTY =
>  Manufacturer's Identification Code (Catalina Yachts) 
> L =
>  Model (Catalina 27) 
> 0612 =
>  Hull Serial Number 
> 11 =
>  Month Built? 
> 72 =
>  Year Built 
>       
> CTYL4327M79J   A 1979 model year Catalina 27. Built in October 1979. Sail 
> number 4327. 
> CTY =
>  Manufacturer's Identification Code (Catalina Yachts) 
> L =
>  Model (Catalina 27) 
> 4327 =
>  Hull Serial Number 
> M =
>  ??? 
> 79 =
>  Model Year (1979).  August is the start of a new model year. 
> C
>  =
>  Month Built (October).  A=August, B=September, and so on. 
>       
> CTYB0184H495  A 1995 model year Catalina 270.  Built in August 1994.  Sail 
> number 0184. 
> CTY
>  =
>  Manufacturer's Identification Code (Catalina Yachts) 
> B
>  =
>  Model (Catalina 270) 
> 0184
>  =
>  Hull Serial Number 
> H
>  =
>  Month Built (August).  A=January, B=February, and so on. 
> 4
>  =
>  Year Built (1994).  Last digit of the year of manufacture. 
> 95
>  =
>  Model Year (1995).  August is the start of a new model year. 
> 
> --- In [email protected], "Jeff" <jeffrparmenter@> wrote:
> >
> > I'm looking at a Catalina 27 down the dock from me and I'd like to know 
> > what year it was built.
> >
>


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