Examples from the Web for off stump
Flower bowled him a short-pitched, fast ball, rather wide of the off-stump.The Wonder|J. D. Beresford
The first ball was well outside the off-stump; it landed in the National School grounds that ran alongside of the school field.
The next ball was of the same length, but this time off the off-stump.Mike|P. G. Wodehouse
At any rate, he attempted no leg-glides on the off-stump, and in consequence found little difficulty in staying in.
In cricketing parlance, he is in that case stronger on his leg than on his off-stump.