Gee guys, thanks for all the replies. Great stuff. Yes, I originally thought it was an orchard PA myself, however the serial number of 133368 leads me to challenger, hence my confusion. I will attach a few pics of the carby side. To answer the other questions, Challengers are pretty few and far between down here. I believe that I have most of the different models that came down under including a few wallis tractors, however, I am on the hunt for a 201 which was supposed to have been sent down here. I will also post a new one on the Massey bicycles that I have found.

Welcome to Massey collectors, it's great to have someone from down under on here and get to see some Australian Massey's. 
The serial number is also stamped in the frame just above the tag, I would be interested to  know if it is the same. Also do you have the engine number, it should be 471 numbers before the tractor number.
this might give us a few more clues.

Graham.

Hi Graham, I know the engine was replaced with a red pacemaker engine, hence the numbers wont align. The entire tractor was painted red.

The number you have is for the second red styled twin power Challenger built.

AussieMassey, Like everyone else has said, great to have you join the MCA Discussion forum. We all look forward to your future posts and other photos/information on your Massey/Wallis from down under. It is also going to be very interesting to watch how this one unfolds on your tractor. Everything I see on your tractor is far from a Challenger, yet how do we explain the serial number tag? This could be one of the more interesting puzzles we have had on the site. Take care, JB

Here's a shot from the rear of my Styled Pacemaker Orchard, serial number 200487. It shows the steering brakes, lowered seat, rear axle housings, etc. Interesting to compare to the rear shot from your tractor.

Nice orchard model. Certainly very similar to what I have here. I have had a younger set of eyes on the numbers. Tractor 133326 and engine 120259. Sorry for the confusion and thanks for the advice everyone. I love a challenge(er) When we get to the bottom of this one, my 101 doesn't line up with the data book either. But one at a time. Buck

Thanks Graham, it looks like I gave you a bum steer with the number. Sorry.. Tractor 133326 and engine 120259.

Hello Buck, glad to have you aboard!

My first worry is that you might want to check under your Challenger.  It seems to have a human leg hanging underneath.  Make sure you didn't accendentally run over someone!

Second - John, I would expect an orchard Pacemaker to have a little bit more of a set back front axle than in the picture.  The front axle placement seems to be right inbetween a standard and an orchard.  Your thougths?

Drew

Drew,

I think I am right in saying that the green orchards were standard length.  The standard green PAs were only made in one wheelbase form.

However the red PAs were made in long and short weelbase form and the short wheelbase type was adopted for the narrower track orchards.

John