- Serial No. 54437
- Serial No. 54548
- serial no. 55001
- serial no. 55017
- Serial No. 551X & Made In GDR
- serial no. 551xx
- serial no. 5527 matching serial no. on neck
- serial no. 55303 c
- serial no. 5543
- Serial No. 5545
- serial no. 55638
- serial no. 5575x made in ddr
- Serial No. 55760
- serial no. 5596 on back of g sharp key