It is a little hard to say, I assume there used to be a sticker on the top plastic cowling with the model name on it but it has been gone for a long time. I could pick it out from a line up of the models, I might have a look on the victa history site and try and pick it. From the pictures I've seen I think its a commando

the only thing I could find on the mower itself was a number on the top of the throtle/air filter cap (model vj165a1)

If there is anything else I can do to narrow the field let me know.