So, you've had both emblem versions shown in my photo, and both of them are considered to be NOS/service parts.
What I'm wondering about then, is which version would be considered to be an "assembly line" emblem? Is it correct to say that the machined version is an "assembly line" emblem?
Consider that when they were building any of these cars, some parts from the original supplier and made exactly like what was being used on either line (Ford or SA) made their way into the supply chain to be sold and used to repair the cars from almost day one. Because of this we find some NOS that are exactly the same as what was installed, because they were, and later NOS where the same company made them in another run, possibly changing due to manufacturing changes or cost or now very close, if made by a different supplier or changed for the reasons mentioned.
Agree with Bob that too many of these may have been replaced with nicer, newer ones during earlier restorations or repairs - possibly even added to cars that didn't originally receive them. Also the details we're discussing are not visible once installed so not enough examples are available to draw a conclusion at this time or likely any time in the future