I can see that this is the most common question on the forum and I apologise in advance but is this an authentic Longines?
Longines male watch | eBay
back of watch is marked
serial number 35810163 and the case is marked ‘FLAGSHIP, L4.774.4, REGISTR.MOD, ALL STAINLESS STEEL, SWISS MADE’
I have emailed Longines (Swatch) customer service but haven't had a reply yet.
Can anyone help by casting an experienced eye over it please?