四川光緒當三十銅元，按背面龍圖不同，可分「立龍」（1）版和「飛龍」（2）版兩種。「立龍」版者，正面中央鑄一花星，外環鑄「光緒元寶」及珠圈，上緣鑄「四川省造」，下緣鑄「當三十」，左右兩側鑄滿文「寶源」；背面中間為龍圖，俗稱「立龍」，上緣鑄英文紀地「四川」，下緣鑄紀值文字，分別為阿拉伯數字「3 0」及英文貨幣單位「文」，左右兩側各鑄一花星，俗稱「十字星」。
「飛龍」版者，正面與「立龍」版同；背面中間鑄龍圖，俗稱「飛龍」，外環珠圈一道，上緣鑄英文紀地「四川」，下緣鑄紀值文字，分別為阿拉伯數字「30」及英文貨幣單位「文」，左右兩側各鑄一「梅花星」。四川省於光緒二十九年（1903）六月在省城（成都）機器局附設成都銀元局內開鑄銅元。次年，又興建銅幣廠，專鑄銅元。四川省鑄造的銅元，按幣面上緣所鑄的紀地文字，可分「四川官局造」和「四川省造」兩大體系。
四川當三十銅元屬於後者。由於四川省的造幣機構有增設和歸併的情況，且缺乏記載較詳的文獻資料，所以，題名為「四川省造」的這類銅元鑄於何廠、何時，目前尚難判定。按照傳統的先後排列法，此類幣歷來被置於「四川官局造」銅元之後。雖然前人對此種排列沒有作過什麼說明，但看來這還是合理的。因此筆者認為這枚當三十銅元，其具體的鑄造年代當在光緒三十年（1904）。
According to the different dragon pictures on the back, it can be divided into two types: Li Long (version 1) and Fei Long (version 2). For the "Lilong" version, a flower star is cast in the center of the front, a "Guangxu Yuanbao" and a bead ring are cast in the outer ring, a "made in Sichuan Province" is cast in the upper edge, a "Dang 30" is cast in the lower edge, and a "Baoyuan" is cast in the left and right sides; in the middle of the back is a picture of the dragon, commonly known as "Lilong", a "Sichuan" in English is cast in the upper edge, and an Arabic numeral "3" is cast in the lower edge It is commonly known as the "Cross Star". For the "Feilong" version, the front is the same as that of the "Lilong" version; on the back, a dragon figure is cast in the middle, commonly known as "Feilong", with the outer ring of beads, the upper edge of which is the English "Sichuan" and the lower edge of which is the characters of the age value, which are respectively the Arabic numeral "30" and the English currency unit "Wen", with a "plum star" on both sides. In June 1903, Sichuan Province started casting copper yuan in Chengdu silver yuan Bureau attached to Chengdu Machinery Bureau. The following year, a copper coin factory was built to make copper coins. According to the inscriptions on the upper edge of the coin surface, the copper coins made in Sichuan Province can be divided into two systems: "made in Sichuan official bureau" and "made in Sichuan Province". Sichuan when thirty copper yuan belongs to the latter. Due to the fact that the mint institutions in Sichuan Province have been added and merged, and the lack of detailed literature, it is difficult to determine where and when the copper coins with the title of "made in Sichuan Province" were cast. According to the traditional arrangement, this kind of coin has always been placed after the "Sichuan official bureau made" copper yuan. Although predecessors have not explained this arrangement, it seems reasonable. Therefore, the author thinks that this coin should be the thirty copper yuan, and its specific casting time should be the thirtieth year of Guangxu (1904).