Build Year from Hull Number

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Rick Gedney
Posts: 19
Joined: May 31st, '17, 07:36

Build Year from Hull Number

Post by Rick Gedney »

Hello - new to group and new owner of a CD Ty WE. Have MANY questions - but first is that my boat's history lists year as 1974, 75 and 76. ? Think it was sold as new in 76. The hull number is CPDD1175N76C. I se a 75 and a 76 in there. Any info? Boat was "Sounder" out of Shelter Island, NY and then "Wy So Lazy" out of Lake Winnipesaukee, NH.
Thanks much,
Rick Gedney
"Bess" Rockland, ME and Madison, CT
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Sea Hunt Video
Posts: 2561
Joined: May 4th, '11, 19:03
Location: Former caretaker S/V Bali Ha'i 1982 CD 25D; Hull 69 and S/V Tadpole Typhoon Week

Re: Build Year from Hull Number

Post by Sea Hunt Video »

Rick:

Several years ago Good Old Boat ("GOB") published an excellent article on hull identification numbers (HINs).

As GOB explains it, the characters (numbers or letters) in the "model-year format" which existed prior to 01 January 1984 are decoded as follows:

Character positions 1, 2 & 3 of the HIN are the manufacturer's identification code and assigned by the US Government;

Character positions 4, 5, 6, 7 & 8 of the HIN are an alpha-numeric serial number established by the manufacturer;

Character position 9 of the HIN could be the letter "M" if the sailboat was built before 01 January 1984. The letter "M" signifies the manufacturer is using the "model-year format" not the "numerical straight-year format";

Character positions 10 & 11 are the year of manufacture; and

Character position 12 is a letter indicating the month of manufacture in the "model-year format". Interestingly, this lettering starts with the letter "A" signifying August; "B" is September; "C" is October, etc.

Before 01 January 1984, if a manufacturer wanted to, he (or she) could alternatively use the "numerical straight year format" instead of the "model-year format". Then characters are decoded as follows:

1-8 are the same as above for the "model-year format";

9, 10, 11 & 12 would be the month and year of manufacture. Instead of an "M" at character 9 signifying "model-year format" there would be a number as part of the month (2 digits), followed by year (2 digits).

Post 01 January 1984 you could use another third format which is called the "new format" (catchy phrase). In the "new format", the characters are decoded as follows:

1-8 are the same as above for the "model-year format";

9 is the month of manufacture - "A" is January, "B" is February, etc.

10 is a number digit signifying the last digit of the year of manufacture or certification

11 and 12 are the model year.

I hope this helps a little.

From the above I am guessing your Cape Dory was built in September 1976. The letter "N" in your post for the hull number may be the letter "M".
Fair winds,

Roberto

a/k/a Sea Hunt "The Tadpole Sailor"
CDSOA #1097
________________________________
"I wish to have no Connection with any Ship that does not Sail fast for I intend to go in harm's way." Captain John Paul Jones, 16 November 1778, as quoted in Naval History and Heritage Command, http://www.history.navy.mil
Paul D.
Posts: 1273
Joined: Feb 6th, '05, 20:52
Location: CD 33 Femme du Nord, Lake Superior

Re: Build Year from Hull Number

Post by Paul D. »

That would make sense to me. Our old Typhoon had a hull number near that and was a 1976.

You may try looking in around the cockpit lockers for a stamped date. Our Ty had Dec 1975 in there somewhere.
Paul
CDSOA Member
Rick Gedney
Posts: 19
Joined: May 31st, '17, 07:36

Re: Build Year from Hull Number

Post by Rick Gedney »

Many Thanks for the info.
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