The core [1CP7WH1-626] contains seven pins and comes unpinned. This article displays a high-quality product - the Best Premium Core WH - equipped with two key blanks. A single core lists at $55, while each key is $6, totaling to $67.
From what I found on safe distributor sites, this is a SAFE COMBINATION CHANGE KEY Marked SLC 7 is for for safe locks Sargent & Greenleaf 6800, 6810 and 6815. KEY Bow is not plastic but heavy cast aluminum.
I couldn't find this change key -6 on the safe distributor sites, this is a SAFE VAULT COMBINATION CHANGE KEY for ?? I'm assuming it's S&G since the slc5 and 7 are S&G Not sure why the #7 was skipped. Appears brand new.