What key

[Markus Faller]

If you do not have levers, it think it is tuned to C. If you have levers, the best tuning will be E flat. So you can reach the most possible tunings. Anne explains it very plausible:

https://www.youtube.com/watch?v=Oq3-Yx3A-JE

[Amanda Barnes]

I think most come tuned to C but a lot of harpists like to tune to E flat.

[Markus Faller]

and there is a nice video from Christy-Lyn as well:

https://www.youtube.com/watch?v=C-1sXC_5iDs

[Lana Wainman]

Thank you for your replies. Both reference links are good. When I pick up my Salvi Mia lever, I’ll ask what key it is in.