Would it not say A300 on the MB ? Not sure just asking... ?
From Goggle :
To check if an Amiga A600 is Revision 1, open the case and look for the motherboard's model name printed on the PCB, which will be labeled "A300 Gayle 01". You can also check the ROM chip, as early revision 1 boards have
Kickstart 2.05 revision 37.299, which lacks PCMCIA and IDE support.
Physical inspection
- Open the case: Carefully open the A600 case to access the motherboard.
- Locate the model number: Look for the main motherboard model name printed on the board. Early A600s were initially called "A300" prototypes. It should be labeled with "A300 Gayle 01".
- Check for an additional chip: Look for an additional chip below the GAYLE chip. Early "A300" boards will have this chip, and later revisions will not.
ROM and Kickstart version check
- Boot the machine: Turn on the A600 and check the Kickstart version on the initial screen.
- Identify the revision:
- If the Kickstart version is 2.05 revision 37.299, it is an early revision 1 board. These boards cannot use the internal IDE hard drive or PCMCIA slot without upgrades.
- If the version is 2.05 revision 37.300 or 37.350, it is a later revision and is not a revision 1.