1951 Longines classic Sei Tacche Watch with Arrow and Arabic Numerals Model 5697This Watch We have here a stunningly aged longines Sei Tacche Reference 5697 (6 case back notches) A military style piece with a super sturdy steel case and beefy lugs. The dial has some age and patina with a beautiful mix of Raised Arabic and arrow head markers. This gives no doubt about its originality. Along with the central seconds and stylish hands , giving a sense of symmetry to the watch. The gilt markers and dauphin hour and minute hands lend