Yes as I had put on the other post.That is the exact model I had put pictures up on.I'm sorry to say but there is nothing rare about the number.By the time Victa got to these models they where bushing out huge numbers of mowers.Before the model 5 there was some scence in there numbers,by the time they were selling these all the numbers went out the window.All that can be told is that would be the original engine.These were the last Model 5's to be made and all the engine numbers had letter in front of the numbers.There is no real pattern to the letters and so far no hard evidence has been produced as to a pattern.The first picture is the 2nd model 5 and the one that is complete is the 3rd model 5.Don't worry about the different's in the toe rings there were quit a few different styles.I'm not sure how many but there were a few.Hope this helps you out.Nice mower none the less.Also just so you know,even though there was a large number of the 3rd version made these bases are certainly getting harder to find.I know they are I want one more and have been searching for a while now.