It's on its side, Erin.  Turn it 90 degrees clockwise. The logo reads 
C & CO and was used by Colgate & Company until probably 1928 when 
Colgate and Palmolive merged into the now more familiar 
Colgate-Palmolive Co.  Date is per the Colgate web site at 
http://www.colgate.com/app/Colgate/US/Corp/History/1901.cvsp.  Also 
per that site, Colgate started using the collapsible tube for 
toothpaste in 1896. Don't rule out the possibility that it was from a 
shaving cream tube though - pre-aerosol can days. The one I've seen 
was recovered from a placer mining site not too far from Reno, NV. 
Seems to me that one was bakelite, though. Yours, being aluminum, may 
be a bit the older.

Robert

At 10:15 AM 10/29/2014 -0600, you wrote:
>Hello listeros,
>
>I am hoping someone might be able to identify the artifact in the attached
>photos.
>
>It is a small octagonal-shaped threaded screw cap. The metal appears to be
>possibly lead or aluminum. I am hoping someone recognizes the maker's mark.
>One theory is that it is Asian. No bottle remains this size were located.
>
>The artifact is from a homestead site in southern New Mexico. The rest of
>the assemblage suggests 1920s-1940s. It was not collected and I have not
>personally visited the site.
>
>Photos of the front and back of the cap can be viewed at this link (it is a
>photo album within Google+):
>https://plus.google.com/u/0/photos/109962100610853878865/albums/6075652626844086481
>
>
>Many many thanks,
>Erin Hegberg
>Phd student, Dept of Anthropology
>University of New Mexico
>503-504-5985
>
>
>https://plus.google.com/u/0/photos/109962100610853878865/albums/6075652626844086481