Hello everyone I've acquired some 1g instabul refinery 1g gold bars not too long ago and I'm kinda worried they're not genuine. On the bar in the pic, there appears to be spotting on the front with a little brown patch under the FI in "FINE" The bar is non magnetic and the security seal is still intact. I cannot find a database for the serial numbers either, nor is there many examples of the red assay version around, so I'm a little worried. I just didn't think it was worth faking 1 gram bars. Any help would be most appreciated.