That's definitely not limestone - limestone is more of an ivory white in the early trucks.
Since that is a Series II or early IIA (pre 1965 by the dash) I'd guess its a sand beige. The 1959-63 SII's came in some colors like mid-grey that were never seen on the later models.
This Land Rover has the windshield mounted wiper motors the banjo steering wheel and light switch integral with the ignition switch of a pre-65 model.
Sand is darker. I have some original panels painted sand and they are at least three shades more toward brown. I don't believe that is a factory color or if it is, they made limestone too dark.