To get the most use, I'd look for an Ilex Universal shutter without the aperture blades (IIRC they came with the Speed-i-o-scope gizmo---do a search on eBay) and mount that to the front of your lens. Use adapters so you can swap between your 16-1/2
and 19"er. That way your lenses will remain intact and you'll have the original aperture markings on the barrel.
My 2nd choice would be a Packard. If you mounted the Packard behind the lensboard you'll be limited to use on one camera---the one the lens board fits. Packards mounted on the front of a lens always looked odd to my eyes---but I've seen then used tht way. A distant third would be having the 19" put in a shutter---why the 19"? Because I have one and it gets a lot of use (I don't have the 16-1/2" so admittedly I'm prejudice!) having one mounted in a shutter would be terribly expensive, I'd think.
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