I’ve got this cool old guitar. It has a rounded pot-belly body and a really unique head. It has all the original tuning keys. On the back at the top of the neck it has a goldish coloured circular label with a coat of arms on it with the name Herman Carlson Levin and the city name Gotenburg on it. Does anyone know what it is worth or have any information on it? The serial number is 58667. Please email me and let me know. Thanks!