The field grade NIDs came in 3 variations. The first, from '26 to '29 had the snail horn cocking indicators and the rolled on setter. The second or Star "Grade" kept the indicators and Setter, added the Stars, and lengthened the fore end. It was produced from '29 to '34 or '35. The last version of the field NID lost both the dog and the indicators,(as well as the deely fore-end latch and stars) and added line engraving and stippleing behind the detinators. They're all good modern guns...Geo