A quick note to save you and the potential new owner the same hassle I went through when I was giving away mine.

• Resetting to factory state resets the Sailfish version to 2 dot something, i.e. quite old.
• The new owner must have a valid SailX license to do anything useful with the phone, including a system update. Even if they already have a SailX license, they need to buy a separate one for each device.
• The new owner can get a free license, without keyboard dictionaries, Exchange and Android support.
• It is not possible to transfer your paid license to the new owner (Jolla Support told me).
• It is not possible to rename your Jolla account (Jolla Support told me).

Basically, unless you are prepared to also give your Jolla account to the new owner, the new owner's choices are: buy their own SailX license, use a free SailX license or (gasp! ) refalash to Android.

I think both you and the potential new owner should know this to know what you are getting into and avoid any potential disappointment.