This is a 1kg can of Ajinomoto in a Showa-retro gold can. It's unopened, with the original shrink wrap on the can's opening, so I haven't seen the contents. The can states, "You can use this product without any quality issues even after long-term storage, so we do not include an expiration date." Therefore, neither the manufacturing date nor the expiration date is known. However, the can is in good condition with almost no rust, so I don't think it's extremely old. My deceased uncle had a large supply of these. Since shipping costs will apply, please let me know if you'd like to purchase multiple cans.