Yes, you're right : it is on the label.

The serial says :

Manufactured in: CK => Cork, Ireland

Year of production: 1990

Week of production: 31

Production number: 15W => 1356

Modell ID: KAT => Macintosh SE/30

Your Macintosh SE/30 was the 1356th Mac manufactured during the 31th week of 1990 in Cork, Ireland.

So, a middle to late 1990 SE/30.

But I've got the full Soundtools suite.

Is that rare ?

How much is it worth (I've got the Analog Interface, SE/30 PDS Expansion Card and the software on the harddisk) ?