Thanks a lot Bunsen and applefreak!

So to conclude about the model number:

A6S0300(P)

It is a Lisa 2/10 or Macintosh XL. Also reverred to as a Lisa XL.

I found an article on:

http://applemuseum.bott.org/sections/computers/lisa2.html

which makes it clear for me that the Lisa 2/10, Lisa XL, Macintosh XL are basicly the same machine:

Models in this Series:Lisa 2: basic system, still used Lisa OS 7/7.

Lisa 2/5: Lisa 2 with 5MB Widget drive.

Lisa 2/10: Lisa 2 with 10MB Widget drive.

Macintosh XL: same computer, different name. No longer ran Lisa OS 7/7 or bundled application suite. Now ran the Mac emulator, MacWorks.

Click to expand...

Remains ....what is the infomation you can read from the serial sticker?

-Is there a production date on like on Compact Mac's?

- Is there location information on?

- What is an Applenet No.?

- The word Manufactured... is it a date code? Or a location code? Or just an internal number???

Sticker: