I have a 3/4 carved bass with an oval label-"APPROVED BY Andreas Schroetter Markneukirchen Sachen". It was in a local school for many years. I'm guessing it's from the 1930's or older. I also have a 3/4 laminated bass with a Gretsch label. No one seems to have heard of a Gretsch upright bass. It appears to be similar to an early Kay C-1. Does anyone have any info on these basses?