Congratulations on your new "elsie". Looks like it was made in 1928. As for the chokes, if nothing was ordered, the factory sent them out full/full. In Brophy's book, 16 ga. Bore: .662, Imp. Cyl. .657, Modified .639, and Full .629. So give or take a few thousands. Hunter arms specified that no gun was made extra full, and they gave the reasons as to why.