I have used the NASA link in Bill’s post to generate the libration-corrected map (what a magic tool!), scaled it to match my sketch which I then overlaid. That’s blown away a lot of the fog and a fair bit of the sketch makes sense now. I’ve uploaded my conclusions. The dark plain right on the limb remains a puzzle however.
![](https://britastro.org/wp-content/uploads/sites/Moon N pole final.jpg)