That is confusing J.D. and Research Letters are the place to start.
27043 on the trigger guard tang of the No. 3 would be from about 1919.

The Double Barrel Trap introduced in 1920 had a wide Schnable BTFE



The Schnable Skeet Special BTFE was not offered until 1929



The Streamline Skeet Style BTFE



It is possible someone returned the guns to Hunter Arms for the BTFEs in order to modify the guns for Skeet shooting. This might be documented in the Research Letter.

All 3 guns should be checked over by a double gun specialist before use, with attention to the head of the stocks for cracks. The gunsmith can check the chokes which may have been opened for Skeet.

There is lots of information in the FAQs, including load recommendations. You can not use steel shot in these barrels.
https://www.lcsmith.org/content.aspx?page_id=274&club_id=43784