Your linked RHO 20ga. A-1 Special is a factory engraved example and without a doubt a real beauty!
I believe the short answer to your question is no. Unless someone comes forward that has access to the remaining Parker Reproduction records and brings to light an exact number of A-1 Specials by gauge, we'll have to go with the production chart shown earlier in this thread and published in The Parker Story. That number is 150 A-1 Specials with factory engraving in all gauges (12, 20 and 20/16ga. combos) were built.
If one were to estimate and use the 3:1 ratio of 20 to 12 gauge DHE-Grade Parker Reproductions produced (certainly debatable if we can or can't) and there were ~150 total A-1s in all gauges, there's likely less than 100 20ga. factory engraved A-1s in existence. The linked RHO gun at #87 was probably near the end of the 20ga. A-1 Special factory engraved offerings.
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Wild Skies
Since 1951
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A1S by ga?
Hybrid Mode