Frenchlover
For once, I asked the AI : The life of a wedge die depends on several factors, including the material used, die design, and production conditions. Typically, a wedge die can produce between 10,000 and 50,000 coins before showing significant signs of wear. In some cases, high-quality dies can produce up to 100,000 coins. However, regular inspection is essential to determine when a die needs to be replaced.
And as you had already told me for the Netherlands East Indies coin that a small variation between dies is not considered as a variety, It might be the same case here with two slightly different dies even though I imagine that modern manufacturing methods leave little room for differences between two dies 😏
I didn't mean to imply that this is definitely because of a worn die only. Just that it is a variation (which could also be due to minor die variations). Mint marks done by hand after the die is made is also a variation if the exact location is different but that's not the case here.
I check the US Mint. The die for 1 cent coins make about 1,000,000 each while the dies for dimes make about 275,000 each.