original 27-29 seamed cutout-to-terminal box conduits difference?

[frank55a]

I have 2 original 27-29 seamed cutout-to-terminal box conduits and they are different. While the judging standards is not specific they seem to indicate they all should be same. Both conduits are the same in all respects except for the hole for the wire from the starter switch to the terminal box. The first conduit appears to match the description in the Judging Standards. However, the second seamed conduit except the hole which is much smaller than the first one and basically round with no reinforcing is the same as the first conduit. While the second conduit has a repair on either side of the hole the length wise ends adjacent to the hole appear to be untouched, specifically no repair. Upon close examination showing a much smaller hole and no sign of a reinforcement, I tend to think it is an earlier version of the conduit. Perhaps with the smaller hole it was too difficult and time consuming to run the wires, therefore the hole was elongated and made larger and thereby in doing so weakened the area around the hole so the reinforcing plate was added. The first picture is of the first conduit, the last 2 pictures show the differences in the holes, and the pictures in between are all the second conduit.

Does anyone have any knowledge regarding this difference?