Decipher Hourston Glascraft Hull ID

[EZZ70]

Can anyone tell me how to decipher these numbers belonging to a 23'er?

 

[salmonkiller01]

Last digit 76. It is a 1976!

 

[EZZ70]

Thank you salmonkiller01, any idea what the others mean?

 

[John s]

I d

 

[EZZ70]

Thank you John s, good stuff

ZHG - Hourston Glascraft Ltd
50002 - serial number
o4 - began construction in April
76 - boat was built in 1976