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			I gave you a good answer.  A Parker could have been made in any choke, but a bore micrometer will tell you the truth.  Some sellers have no idea what they have, and that includes big name dealers.  A PGCA letter may tell you if some rare choke was original equipment.  There is a lot of PGCA information on 1917 Parker single barrels.  What is the serial number of the gun you are interested in?
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