I have 2 pair of 'em sourced thru CF sources, and one pair I got thru US sorces, and they are both identical, even with the same numbers on the inside.
The CF issue ones are off the shelf purchases of generic US boots.
I do believe that the US company Altama makes them, with the Panama sole, and marked Ro-Search on the bottom. If you want a cheap pair, go to ebay and do a search for 'desert boots'. You can land a cheaper pair that way.
Cheers,
Wes
PS - there is 2 types, in short the my CF and US sourced ones have padding near the top, and leather support on the sides. Altama also another type. Its shorter and without the padding along the top, and nylon instead of leather supporters on the sides. These cheaper boots are identical to the old US green type boots less the OD canvas, spike protective, vent holes, leather instead suede, and of course colour black instead of tan.
This different version has the same Ro-Search and Panama sole, and are also genuine, but just slightly different.