Peculiar No.5 silent burner - any similar?

This came on a pre-1911 Primus No.5 in the UK, but does not match any other Primus No.5 burners I have or remember having seen. So where does it originate? Does anyone have or recall another that matches?

Specific features of note:

1. Full 'U' primary feedpipe, not separate feed tubes:


2. The central spigot is NOT the usual simple through tube, it is IN THE FORM OF A CONE:


with a wide base opening on the underside:


The very deep fully enclosed top skirt, shows no indication it ever had a fixed spreader ring.

Any thoughts or suggestions regarding origin, maker or just similar burners gratefuly received!

 

Additional point re the tapered cone spigot - the level of taper is such that a standard inner cap will not fit in place without having the inner tangs bent back


@kerophile @Radler

 

Although the design is a little different, the construction of that burner with a conical, quiet cap came to mind.
Maybe something like that?..
Juwel 31b

 

I have a similar design somewhere (origin also unknown).
Mine has intake holes at the bottom and no central tube.
A Primus 1Jr was mounted on it.
Primus 1 J:or.

 

A similar burner design is found in Spanish stoves.
@igh371

 

..I overlooked that important detail and caused a bit of confusion.

 

but no, I think you're on the right lines. Your mention of Juwel too. It had crossed my mind that several German manufacturers used the full 'U' primary feed pipe burner construction at one time, and, in the case of Graetz, into the 1920s at least ...

 

Thanks.
Actually, that’s clear from your recent example.
Ehrich & Graetz, 'Graezea' silent burner, late 1920s

 

So maybe possibility of German origin for this peculiar burner. But still no exact match from anywhere.

But still possibilities for appearance different ideas out there? More precise or radically different? The door is still open???