Vintage Antique Retro British England 70's Smiths GMT ✔︎ Case: 37mm (excluding crown) ✔︎ Lug width: 19mm ✔︎ Comes with a Phoenix NATO strap ✔︎ Hand-winding, working ⚠️ Calendar does not advance. It originally worked, so I think it can be repaired. ✔︎ OH unknown I don't have the equipment to open the case back. I cannot determine the current time error. I believe it functions without issue during normal use. As this is an antique/vintage item, the accuracy and condition are inferior to current products. Please understand that there may be daily variations and deterioration, as is common with used and older items, before purchasing. Cancellations and refunds after purchase are not possible to prevent product substitution.