Mommy gave a nice gift in 1884. Big 18K 18 size cases are really rare compared to 14K. Had this for 20+ years. Just made record photos and discovered unoriginal movement. A best 1888 Elgin probably replaced a cheaper movement not an Elgin. Serial number and case mark near serial 0 show this. A common situation; an uncommon gold scrap survival.
Add photos of recent purchase of similar all original 14K. $200. total cost mistake by seller and myself. Not marked on back cover as usual but inner cover. Notice 2000000 serial number difference but identical. 1891+