Solder for 10K Gold vintage "N" metal solid tab watch making jewelry repair

Description

Vintage "Solder for 10K Gold" with initial "N" (brand?) - small metal plate or tab found with a group of watch repair items. Supposedly this is a tab of 10K solid gold that jewelers would use for repairs or soldering but it is
untested
as to metal content.  1" x 7/8".  Weighs 1.5 grams.
Bent, scratched.
Sold "as is" with no guarantees as to specific metal content.