What is the National Remembrance Shop in Washington DC and does it still exist?

Answer 1

I did track down this reference from the Washington Post of March 5, 1915:
http://www.newspaperabstracts.com/link.php?id=29492

The store was located at 14th and Pennsylvania, which is now the site of the Marriott Hotel and National Shops Mall.

Based on the age of the pieces which tend to on auction marked from the NRS, my guess is that it probably went out of business decades ago.

Try the Washingtonia division at the public library in DC, they know everything about Washington history:
Telephone: [phone]