Hi, I need some help please. I have recently come across a G.H & S Banjo/Mandolin, not really sure what it is. It has 8 strings, and a gold embossed stamp at the top of the neck. It is also stamped with 'Model XXS' just below the Trademark. I was wondering if somebody could please shed some light on this for me, by giving me a rough guess at the production date if you can. Thank you very much.