There are plenty of through-hole devices reaching 30 or more amps.When they get up to 5A is when you start seeing the screw in studs.
The ones you show need to be attached to a heat sink for more than a few amps.There are plenty of through-hole devices reaching 30 or more amps.
Yep, at 30x mag, I can pretty clearly make out the 100V marking and residual paint substrate.There is writing on those diodes???? You must have a good magnifier!! Or those are a different brand than the ones I bought way back when. in 1968.