Australian Utility Knife AUK. These were made as a GP knife with killing properties for service in the Pacific.
This is a Whittinglowe Adelaide South Australia made example with others being constructed by Greg Steel and East Brothers.
The knife was designed due to a request by the OC of the 2/3rd Independent Company who was seeking a utility/fighting knife for use by these units but was mainly issued to US troops on a US Army contract.
Whilst not rare they are not to easy to obtain in this country as most ended up in the US post war.
The I under the pheon is an inspectors mark and has no relationship with India.
Thanks for looking