In this case it probably doesn't matter where these measurements are. That is very thin regardless of where the measurement is. And remember, the smaller the gauge gets, the higher the pressure goes.
Granted 16 gauge pressures are not too far off from a 12, but if the bare minimum for a 12 ga. is .020, that should tell you something. If this is a best gun (and everything that implies financially), it could not be submitted for proof with those measurements. If the sleeving is done here in the US, and not re-proofed, it does significantly hurt it's re-sale value down the road. May or may not be a consideration right now, but is something to think about before a price is agreed upon.
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“Nitro cracking in woodcock cover has something about it as respectable as a village church bell.”~Gordon Macquarrie
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