Michelin "X" the original.... came long before all the other XZL, XCL, XL, XYZ, XS.
Michelin X was stock tire on early 90's & 110's on the continent... an all around tire. I think I got about 90000km on mine a few times around the globe . Compound pretty hard, pretty bad in the rain, good on the road, soso in mud.... was a 7.50 R16. Replaced them the with the NLA BF Track Edge, that was like rails in the snow but wore much faster.
XYZ came on a firetruck I owned, special snow tires wore out within about 2 months when temps went up, never seen another set.
1967 MGB convertible
1966 SIIa 88 Softop Perkins Prima Powered
1964 SIIa 109 Rosenbauer TLF
1976 1ton Rapier missle Sankey trailer
1996 BMW 1100 GS
wanted ! 107 wagon / 110 wagon v8 or 300tdi