I am not so sure the two go together. If the needle retracts, why would you need an additional hard case? The heavy gauge of the needle and the (linen?) thread indicates it was probably used to sew canvas. I would bet it was carried for repairs instead of used for initial production. The "case" is excruciatingly familiar but I can't place it yet. Are there any wear patterns on it? I am wondering if something slid into it. Are there any wear marks or solder points on the back of the case?
-e