Debugging Station DTL-H1200 - pre-production unit?

[Twilight]

I've bought it in Japan with old junk. What's this? A pre-production unit or something else?

It has "SONY - NOT FOR SALE" sticker at the bottom.

IMG_0675.JPG

[pool7]

I would assume a pre-production unit would either have a very low or no serial number at all (like most prototypes?)... but I could very well be wrong.
Though I must admit I never saw that NFS label before in all the pictures I've seen of debugging stations.

[Twilight]

Normal label.

IMG_0676.JPG

I've seen the same NFS unit years ago.

[H360]

Must be an early make of the system, or it was only intended to Sony staff. I say that, because the serial number is very low.

[Cyberghost]

Didn't another member have a grey model with the same sticker also? IIRC his (or hers) also had no other labels or stickers.

[sp193]

Is the wattage of the early units even that high? Usually, the earlier units have a higher power consumption as their hardware is usually less efficient.

E.g. The SCPH-10000 has the highest wattage of all PS2 consoles, and it heats up the most as well.

The factory name is missing as well. I don't think that even the early Playstation development units lack the factory name, do they? I know that the newer consoles lose the factory name stamps once they get manufactured overseas.