Question on 1981 Engraved Spyderco Worker

[Martin Norcross]

Hi, I am a newbie collector. I wonder if someone could tell me that this item up for bid on eBay is quite desirable.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=2274394967&ssPageName=STRK:MESE:IT

If you can't click on it, please go to ebay.com and search
2274394967

The title is: RARE 1981 Spyderco knife Engraved folding Worker

Any info you could give me on this one would be highly appreciated.

Martin