I don't recall ever having seen it shown as an individual model Jasper, but I might have seen it as an "also available in" entry, which they often did to refer to dial variants not shown. The 18K Carrera 2456 was often just a footnote too - "(not shown) same as Ref. 2447 S but 18. Karat gold case" is all they have to say on that in the '67 catalogue. I reckon the Camaro 7228 was probably relegated to a footnote too, if it was ever shown at all.