Small Engines (Lawn Mowers, etc.): Kubota year model needed

Question
My son (14) and I, have started to restore vintage engines about 3 years ago. Now he has restored his first engine (with a bit of help from dad). It is a Kubota with engine number ER30-N-00479. My son wants to know the year model. Can you please help?

Answer
From Kubota's website:

"What year was my Kubota manufactured?
To identify the exact year your Kubota was manufactured, please click here to contact our Customer Satisfaction group. Please provide your Model number and Serial number. Your dealer can also assist."

Can't find much info but the following may help:

http://www.orangetractortalks.com/forums/archive/index.php/t-996.html

http://www.kubotaengine.com/products/engines/engine-serial-number-identification

The second URL maybe more helpful.

Eric