help identify this transmission. Supposed to be A518

Thanks for the reply. Yes the snout is machined just like a lock up but I was wondering more about the converter. I remembered I had a lock up converter in the shed and pulled it out and had a look. The converters look the same inside with a small lip right at the end near the bottom looking in. One of my non lock up converters doesn't have the lip so hopefully its a lock up.
I should be able to just remove the weight and use it as I think the small weights seen in the pic is to neutrally balance it as there is one on each side.