Dating Hohner Dreadnought

[Gerald Campbell]

I purchased a used Hohner Guitar. I would like to determine the approximate date it was produced. The label inside the Guitar says it is Model 350 and Serial No. GM01G11212 and it says it was handcrafted in Indonesia. With the guitar came an excellent hard case, a strap, a simple capo, a pitch pipe for the standard EADGBE guitar tuning, a Vinci cleaning cloth, and Vinci and other picks.
I wrote Hohner and this is all they could tell me It is a dreadnought; mahogany back, sides; select spruce top; rosewood fingerboard and bridge; 2-way adjustable tension rod; 20 frets; enclosed tuning machines; hard shell case; bracing: X-type; soundhole: round, rosette concentric rings guitar hardware: chrome, die-cast, grover tuners; colour: natural