I have successfully used the current production Thunder 380 single stack 7 round magazines in my Models 83, 95, & Thunder 380. These have 6 witness holes on the side.
The model 383A uses a single stack "square" face (with rounded corners) magazine like the current production Thunder 380 7 round mag. (I have not personally tested this combination). These have six witness holes on the side or three witness slots on the back.
The model 383DA uses a single stack round faced (half circle) mag with an upper right side latch slot and a lower right side mag safety "bump". These have three witness slots in the back. (Very hard to find)
The models 383 and 97 use a single stack round face (half circle) mag with a lower right side latch slot and no mag safety feature. These have three witness slots in the back. (Difficult to find)
regards jab
(Long story short - pollyb is a long standing handle, jab is a male.)