Tim, You know more about M38s than I do. (Much more!) I looked back at an earlier thread where I had posted a picture of my tub (removed from the Jeep), and someone else posted that it was an M38. You corrected him, saying it was a repro.
I was just pointing out that it's easy for those of us with only passing familiarity of the designs to be mistaken, as there can be a variety of different repro designs out there from decades past, that may look more or less like various different Flatties.
The extent of my knowledge is much more limited--I looked at the first pictures in this thread and noticed only that the ones labelled CJ3A didn't have the Willys stamp on them, and (I think) that means that it wasn't an original CJ3A tub. But whether it's a repro or an M38 (or GPW/MB) is beyond my level of knowledge.
BTW--what's the difference between a CJ3A grille and a CJ2A grille? (Looking at early comments in this thread.) I've got two grilles (both of which I assume are repros) and I don't know what they most resemble. They're both in much better shape than my tub was, though, and can certainly be used again without much more than a coat of paint.
-Paul