4205-015X Tuna ??

I have never seen one of those before Dave, really interesting.

TheTigerUK said:

I have never seen one of those before Dave, really interesting.

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Looks like a modification to me, and a new challenge for you Tiger

scubapro said:

Looks like a modification to me, and a new challenge for you Tiger

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I agree, the shroud does not fit the case like I would expect from a Seiko factory design.

The caseback shot tells it all. Seiko wouldn't have curved the edges on the underside if they intended to fit a shroud. It's just like on the TST. John's work is top notch, but there's no material to work with on those bottom edges.

That's where I'll stop the comparison because, while it's a bit difficult to tell from the pics, there are a few indications that the fit and finish of this doesn't measure up to John's work.

The clue was in my post guys -"4205 midsize Tuna mod" . I know it's not original, but I wondered about it's history and build.
The 4205 case does seem like a mini SKX, and I was thinking maybe somebody used a mini-tuna shroud or made their own.