The gas limit for the first 10,000 Ethereum blocks was approximately 3,141,592 gas per block. This is reflected in early Ethereum block gas limits around block 200,000 (which is shortly after the first 10,000 blocks) having that value, indicating the initial gas limit was set in the low millions range for the earliest blocks of the network in 2015. The gas limit has increased significantly since then with upgrades, but for the first 10,000 blocks, it stayed around this initial value.