There's a simple test for stainless that I picked up from Crutchtip:
Get some liquid gun blueing. Put a small amount on a Q-tip and dap it on a non conspicuous area like under the choil. If it's stainless, it will wipe right off. If it's 01, it will "take".
This worked for me.
Best,
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Ron Mathews RKS No. 4223