It is impossible to determine the authenticity of this gold ingot, because it is difficult to determine its true nature with only one photo. The authenticity of gold ingots needs further identification, such as composition analysis and manufacturing technology of gold.

If you suspect that this gold ingot is fake, I suggest you take it to a professional appraisal institution for testing. In addition, if in doubt, you can also consult a professional jewelry appraisal expert or institution.

Besides identifying the authenticity of the gold ingot, we should also consider its possible legal problems. If this gold ingot is a cultural relic or owned by its owner, it may be illegal for you to hold or sell it. Therefore, it is best to understand the relevant laws and regulations before doing any testing or appraisal.