Christie's press release [Christie's Voyage to Another World: The Victor Martrin-Malburet Photograph Collection](https://www.christies.com/presscenter/pdf/9855/Christie's%20Press%20Release%20Voyage%20To%20Another%20World_9855_1.pdf) includes the following:

> Lot 345, The only photograph of Neil Armstrong on the Moon, July 16-24,1969. BUZZ ALDRIN [APOLLO 11]. Estimate: £30,000-50,000

But who is this, where are they, and what is the name of the process by which this image was recorded? Is Christie's press release somewhat less than 100% correct?

See also https://space.stackexchange.com/q/20071/12102

Cropped from NASA AS11-40-5903 found [here](https://commons.wikimedia.org/wiki/File:AS11-40-5903_-_Buzz_Aldrin_by_Neil_Armstrong_(full_frame).jpg) 

[![Cropped from NASA AS11-40-5903](https://i.sstatic.net/zEctq.png)](https://i.sstatic.net/zEctq.png)