Looks like that F8 was pilfered from a 122-key Model M, if anything.
The Clickykeyboards example has several substitutions from the original keyset.
1. The Ebay one has a Task/Menu key in the Print Screen key spot, while the Clickykeyboards one has a standard Print Screen key.
(I was wrong in my earlier comments about this.) The eBay example is correct. The Print Screen keycap on the Clickykeyboards example is a substitution.
2. The Ebay one has a "Bgn L" key in the Home key spot, while the Clickykeyboards one has a Field- key there.
Again, the eBay example has the original keycap. The Clickykeyboards example has a substitution.
3. The Ebay one has green lettering on the arrow keys, while the Clickykeyboards one has nothing.
And again, the eBay example has the original keycaps. And again, the Clickykeyboards example has substituted arrow keys.
The eBay example appears to have all of the original keycaps except for the F8. The F8 should have "Merg" on top and "F8" on the front.
I've got a 1394618 with a complete original keyset and a 1392464 that was only missing the Pause keycap. The 1394618 Pause key has the "Break" on the front in green. I'm looking for one of those and using a normal Pause on the 1392464 in the meantime.