Without holding it in my hands, I would say it appears to match the wiper model TR-C2B as depicted in the Judging Standards.
The shaft should measure 2-3/4” in length.
According to the JS, it should have a waffle pattern on the top of the body, which isn’t shown in your pictures.
It looks very similar to the model used for the early production Victoria.
I’m sure the 400-A owners could give you more insight.