Remington introduced the 870 Special Field in 1984 and made them for 12 years. The first 3 years they were fixed choke guns, but in '86 you could order a Rem Choked barrel. From '87 on Rem Chokes were the only option. Barrel length was 21" until the last 2 years of production where it increased to 23". These guns, especially the 23" models, seem to bring substantially more than book value.
The 1100 Special Field had a longer production run than the 870.