difference No 83-1 - No 83-2 ?

[Fusse2004]

Hello everyone! What is the difference between a No83-I and a No83-II ?

 

[MINENAZ16]

If your question is about British artillery fuzes No83 series, I don't know exact list of changes but diagrams could help.
Externally it's easy to make the difference as the top of Mk1 is fitted with a hole.

 

[Depotman]

List of Change No. 18036 explains it well; Depotman