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It's an early Version 2. There are other differences between a Version 1 (Red Dot) and a Version 2. Early Version 2's shared a lot of similarities with the Red Dot, whereas later Version 2's were more similar to the Version 3, such as the serial numbers inside the battery compartment. Nonetheless, it's a nice find and looks to be in good condition.
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It's a factory refurbished red dot.
The serial# sticker is without doubt a red dot (and not V2) sticker, the serial number itself matches this.
When the "bug" was discovered, some/most users sent their machine to HP to have the ROM replaced (you can probably see some soldering remains from the manual rework on the PCB). Often "bad parts", like a damaged case part, were replaced for free. The original red dot faceplate was probably worn and has been replaced by a V2 part (as if the red dot hole was good for anything anyway <g>), after fixing it, the back label had to be replaced as well - with a V2 part (stating the "35").
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...that my '35, #1143A31237, purchased from the original owner, is an early version 2 with bug that was refurbished by the owner. The back label states "HP-35" and one can see faint remnants of the old label. Plus, the original owner provided documentation indicating when the calculator was serviced for the "bug."
I'm judging that it is early v. 2 (without opening it) based on lack of red dot and S/N label style. It is conceivable that the faceplate was replaced, but the original owner had the machine serviced within a year or so of purchase, so I doubt this.
-Tim
Edited: 22 Feb 2010, 7:31 p.m.