I found a vintage watch. It says Nostrana. And on the back it says rolled gold, 20 micronis, stainless steel black. On the band it also says ‘excalibur’ and ‘10 R.G.F.T.’. What does that mean. I want to sell the watch so I can buy something for my son with the money I made from it. But how much should my asking price must be? Is it worth something. I found somebody on ebay asking 180 euros and on etsy 35 euros. I wil insert some photos