Hi Kerly,
It's amazing what people will do just to get a sale. I hope you got it at a really good price and not pay too much.
I'm going to have a stab in the dark and say that it was built around the 1977~78 mark.
Can you supply us with a few more close up shots around the engine mounting area, the inner mounting bolts area and not the outers. Also a have a look at the engine and see if you can decipher the numbers stamped on the cowling as in the photo below.
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2016/10/full-5156-30526-briggs__id_sample_photo_model_type_and_code.jpg)
Also a photo of the area where the clutch slide onto the engines PTO shaft as I suspect some damage there.
Close up photos of the drive train. (with chaincase removed)
Tilt the mower back on it's handles and take some close up shots of the reel and bed knife contact area.
I'll look forward to the photos and we'll be happy to help you from there.
Cheers,
BB.