Is the writing on Simuwu Ding Oracle Bone Inscriptions or inscriptions on bronze?

It should be an inscription on a bronze ware. Oracle Bone Inscriptions generally wrote it on the tortoise shell bone for divination and recording, which is primitive.

The bronze inscriptions on Yin and Zhou bronzes are also called Zhong Dingwen. Shang and Zhou Dynasties were the bronze age, with the tripod as the representative ritual vessel and the bell as the representative musical instrument. "Zhong Ding" was synonymous with bronze ware. Bronze is an alloy of copper and tin. China entered the Bronze Age in Xia Dynasty, and the technology of copper smelting and bronze ware manufacturing was very developed. Because copper was also called gold a week ago, the inscriptions on bronzes were called "bronze inscriptions" or "auspicious words"; This bronze ware was called "Zhong Dingwen" in the past because it had the largest number of characters on Zhong Ding. More formal.

So it should be Jinwen.