10k GOLD filled....15j....screw back case....BEAUTIFUL! MOVEMENT SIGNED: Imperial, non magmentic, Swiss, 15 Jewels, and Buren W Co. For additional markings see pictures. CASE SIGNED: S.W.C. Co, Gold Filled, 20 Years, *, and 1560441. From what I have found online: 10K GOLD filled case. I believe this is a 16s but check measurements to be sure (case is 1 5/8" wide not including the loop/crown). CASE CONDITION: The glass has no cracks or scratches. Very light signs of age only on the case...one small ding on the back. The outside back has been engraved with initials. The loop on the top rotates perfectly. MOVEMENT CONDITION: It does wind and is running as seen in video. The time can be adjusted. All hands are still on the watch. May or may not need maintenance as it is an antique. I WILL BE LISTING SEVERAL POCKET WATCHES, SOME GOLD AND SOME SILVER, FROM THIS SAME ESTATE SALE COLLECTION. PLEASE SEE MY OTHER LISTINGS. It will be protected well and insured. Location E1, FBMP, MER