Can anyine identify this electrical line type and load rated for?

[Spins49]

attached image of a line i dug out to find feeding a 100Amp subpanel (25 years and no issues I'm told). I can't make it out and am hoping someone experienced might be able to identify it and confirm if it is indeed the right wire type to handle the load. It's a 100Amp main subpanel switch, with 80 Amps in switches on the board. Thanks for any help!

 

[Megawatt]

attached image of a line i dug out to find feeding a 100Amp subpanel (25 years and no issues I'm told). I can't make it out and am hoping someone experienced might be able to identify it and confirm if it is indeed the right wire type to handle the load. It's a 100Amp main subpanel switch, with 80 Amps in switches on the board. Thanks for any help!

Spins49 it looks to me like # 10 which is only good for 30 amps