year

You're missing a bunch of numbers and a letter or two. The 4-digit number on your main sail / sail bag, only denotes the number of your hull from the first produced, ie they started with 0001, the first, then 0002, ....then 3534, then 3535...
The full ID code is 12 characters long and should be on the upper starboard corner of the transom exterior. Will be on your title too. Here is a link to decode it with when you find it:

Hull ID Decoder - Catalina 320 International Association
 

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