I was also apprenhensive of Sea Gull but the ST-25 on my Tisell pilot is keeping pretty good time, like gain about 4 seconds daily.Sea-gull@sahara desert, not atas or accurate like IWC but it tell time.
http://i1285.photobucket.com/albums/a590/MRozaini/IMG_20160821_101542_HDR_zpsgmlcb0ie.jpg



