Hope this is okay.
I have tracked over 40 HP 01 ebay sales the last year and seen from 400 (lowest price non working) to $4000 highest price working in box and pristine with paper. I have the Word file that I pasted together from all the Ebay listings as I was tracking them if anyone is interested.
The highest prices which are hard to distinguish from one another; $1500 - $4000 are garnered by:
1. pristine working examples
2. complete perfect crystals with the Hewlett Packard name clearly stamped
3. boxed with papers/pen/guarantee and battery holder replacing tool.
4. of course the bracelet stylus is included.The lowest prices; $400 to $700 are achieved by:
1. non working
2. cases in very poor shape
3. HP name missing and crystal damaged.
My examples in the pictures to follow include the one in the box which was 800USd last year and has a standard two serial numbers which indicate it was for the retail market. It is in the same condition as the one that just sold, absolutely new old stock.
The other 3 of which two are pictured were 300UDd and 400USd in non working condition with no paper work or boxes.
The 400USd one was a prototype as indicated by the lack of serial numbers on the case back. The information I recieved about this watch was a personal talk to a retired watch design team employee at the Corvalis centre. It was his watch that I purchased and then restored. The owner is now in his 80's (time flies!). He stated that the watches without serial numbers were prototypes not for retail but ended up being used for showing and demonstration purposes.
I have restored two others for other collectors. One of those was sold after restoration for 1400USd.
NO SERIAL NUMBER PROTOTYPE from Corvalis design team owner $400:
BOXED NOS $800
BOXED NOS
RESTORATION $300
RESTORED FOR CLIENT AND SOLD AT 1400USd
I would venture to say that $5000 was steep for me but to a "I need that watch at all costs collector" well who knows? The lack of serial numbers on the case indicates that it to is a prototype making it one of the earliest examples I would know of. This would also increase the price.
700 to 1500 seems to be the going price for a working watch, the low end for a working watch with no paper or box in poor physical condition and 1500 for a working watch in extremely pristine condition with paper work and box. Of course I have seen them stray up to 2000 USd as the bidding goes wild.
Hope this helps!!
Cheers and Merry Christmas
Edited: 17 Dec 2007, 1:34 p.m.