Skey was an open mold (owned by Burt).
Wore out maybe 10 years ago and now in the Museum.
Same for the Lkey.

Ernie was in business from about 1980, still is now.

However, as John pointed out, that chip is from the original smooth center mold and is therefore per mid 1960's.
Not an unusual insert pattern for back then, Thunderbird used that in the 1940's.