Parker made a lot of guns for trapshooting. The straight stock (to make it shoot high) and double ivory beads suggest that yours was built for that. Parker did make guns marketed as Double Traps near the end of their operation that have a number of features such as single trigger, beaver tail forend, vent rib, ejectors etc. Trap shooting is an old game and many guns were built for it and some had more options than others. Generally speaking the over riding feature of a gun used for trap is the straight high shooting stock. A letter would tell you as much as is known about your gun.
Pictures of your gun would be welcome.
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