Keyboard IBM model M Mechanical keyboard with ps2 attachment. 

Year of manufacture 1994, cleaned in all its parts, tested and fully functional. Tests performed with PS2 adapter (forged with keyboard). 

All rivets have been checked and are firmly on the steel plate.

All springs have been checked, and are in excellent condition.

This model has a small speaker housed on the bottom of the body. 

I don't know the specs or what it's for. I restore IBM keyboards but I have never seen one like it.

Original IBM SDL cable in excellent condition as per attached images.

I am available to provide additional images if interested.