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At the risk of looking like a "me too" post, I'll be offering a very nice 4-valve top-action ("Howard Johnson") BB-flat Mahillon in a few months...
...after I get through a few other obligations.
(The difference between the genuine Mahillon instruments and the B&S-made "HoJo" knock-offs (other than the signature nickel plating) is the bore size.
The genuine Mahillon (BB-flat model) bore size is 16mm (c. 5/8"), whereas the "Meinl-Weston" BB-flat model bore size is 17mm (c. 43/64")
This instrument is currently NOT quite ready for sale. <sidebar>