This is another of Lyon & Healy's own C-Melody saxes.  The " Couturier "

On this sax, note the Martin style bevelled toneholes and bow protector -

PLUS the Conn style 'mercedes' Low-C guard, and the curved 'Conn' neck brace....

 

   

( Addendum )

Another interesting webpage link below about Lyon & Healy, with further links on that web-page - there is other ongoing L&H research taking place, it's become a bit of a cult, and of particular interest to me as I have both L&H C-Melody and C-Soprano saxes...

                                                http://www.horn-u-copia.net/serial/Couturierlist.html

The build quality (and sound) of all the L&H's I've owned and played far exceeded their achievable market value  and regrettably that state will probably continue.