Can anyone identify this weird key blank,? I have a customer who needs a duplicate. I searched through the Ilco, Yale and corbin/russwin catalogues : Locksmith

Not a locksmith, but I can confirm what u/marccerisier and u/supa325 said.

It is a restricted key that should only be able to be copied at the locksmith listed on the key.

I have these keys for my restaurant locks. My locksmith is very serious about checking ID and signatures before allowing copies of the key to be made.

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