Dave,
That is the number 1 size buttplate. So, that would mean your gun was built as a 16g originally.
Your gun was either rebarreled by Meriden. Or maybe later on by someone else. I have seen some guns before that were rebarreled by Lefever Arms in the 1960s and 70s. They had a lot of left over parker parts inventory as well as a lot of factory equiptment and they were well equipt for rebarreling Parkers with NOS barrel sets.
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B. Dudley
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