Ann, thank you for sharing your experience and thoughts.

Although the doubled subscription fee doesn't seem to be caused by the insecurity of NG, I'm also concerned about the issue.

I found that the automatic subscription of NG in my PayPal account was checked and I forgot about that and renewed the subscription manually, which seems to have caused the problem.

I unchecked the automatic renewal of the subscription.  I confirmed that my NG Supporter status will be kept for two years (until 2021), so the problem is practically solved.

very nice story and brave "North faces" withstanding the sun in the south.  Thanks a lot for sharing this set of images - it has been much too long ago that i was there.....

The ser. No. 179161 suggests that it could be one of the very late K version converted with the appropriate Ai kit.  According to your website. 

You are absolutely right! However it is AI, not an AI converted "New Nikkor" (K).  It is not the first time I have seen native AI lenses with K serial numbers.
- the focus grip is like an AI lens, the grip on the K version is more finely divided, and slightly darker/glossier
- it has the maximum aperture index post, at about 6:30 o'clock on this image. Only AI lenses have this:

Summer at sea.

John. love it 

Thanks, Tom.