The pattern on this model is the 1941 Afrikakorps Disruptive Pattern (Heeresmitteilung 1941, Nr. 281):
RAL 8000 Grünbraun - Base Colour
RAL 7008 Grüngrau - Disruptive Pattern
Panzergrau vehicles deployed to Africa were repainted in the new base colour with disruptive patches. The base colour dominated the disruptive pattern by a factor of 2 to 1, with soft contours between colours. That lets you show chipping back to the Pz. Grey.
The order was changed in 1942 as the fighting moved west, where the desert was a more yellow tone. The 1942 Afrikorps Disruptive Pattern (HM 1942, Nr. 315 of 25.03.1942) was:
RAL 8020 Gelbbraun - Base Colour
RAL 7027 Sandgrau - Disruptive Pattern
This new pattern for Africa was introduced in March of 1942. Available paint and camouflage paste of the earlier pattern was to be used up, resulting in a mixture of patterns in the interim period. The new Africa pattern was also used in Crete (HM 1942, Nr. 600). Water soluable, and removable camouflage paste was to be used to paint vehicle tarps. The first Tigers sent to Afrika were apparently factory painted in the 1942 pattern - this is the research Bovington used on their Tiger, painting the 1942 pattern right over the primer.
The later Tigers were transferred from France, where they had been delivered in Panzer Grey and chemoflaged with Chocolate Brown, and apparently received an olive or field grey overspray to blend them into the green tones of the Tunisian landscape better - though this is a controversial issue, so I put this out there expecting comment