Hello! My first post. I love all types of watches and am starting to collect them. This one belonged to my grandfather.Still keeps good time(although low 12 hour reserve) would really love to know more info about it like circa 50s? Etc.. Have checked for days (Web) at all Eternamatic, Eterna-Matic,Eterna and have found nothing quite like my piece. I hope someone can help. Thanks.