Muffler Question

[Model A Ron]

It was brought to my attention that some after market mufflers that were manufactured over the years had a lot of back pressure. From what I understand the original stock muffler or the Aries that is offered today as a reproduction have much less.

That said I decided to look at my muffler to see what I had. From the measurement I took it's 29 1/4'' from seam to seam and 35 1/2'' from the back seam to the end of the tail pipe. It may be an original but I am not sure.

From the below photos can someone help me identify my muffler?

Thanks
Ron