Jack,
Yes, it can be very difficult to determine choke on these early Parkers without first determining the bore diameter. The two most recent ones I have examined have identical bore and choke configurations. Both have .793 bores and .040 of choke. They are about 20,000 apart in serial # range. There has been a lot of discussion of the variations in 12 gauge bore sizes from Parker, I think the 10 gauges are probably just as diverse over their manufacturing period. They probably don't get as much attention or study due to the fact they are not as popular with today's shooters.
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