北宋货币大观通宝，是由徽宗御题钱文。宋代与历朝有所不同，每换一种年号就开炉铸新币，若年号与宝文相重，则更铸非年号钱。终宋三百年，通行以小平折二钱为主，其间也有大钱流通、钱币的轮廓，尺寸都有一定标准。因此宋钱版别极多，历代罕有，钱文除真、草、隶、篆，行外，还有便是北宋徽宗的“玉划银勾”瘦金体。
大观通宝广草观
大观通宝广草观,特征:文字纤细,大字阔,通字走之部与众不同,广草的得名来自于观”字的草字头长,右端与“见”部平齐.
风流天子出崇观，铁画银勾字字端。闻道蜀中铜货少，任凭顽铁买江山！”诗中传述的便是北宋徽宗传神的瘦金体。徽宗早年继承帝位，崇尚书法绘画艺术，却不善理国。他自己则御书亲题其中的崇宁通宝、大观通宝，政和重宝，宣和通宝背陕等钱文。御书钱钱文精美，铸造技术高超，为历朝之冠。
钱币直径4厘米，为折十规格，属于大面值铜币，钱币正反面氧化一致，有着明显的黑漆古包浆，表现开门，为精品钱币，又是书法钱，十分耐赏！
黑漆古，是指古铜长期存放在大气中锈蚀机理分析紫铜、青铜、黄铜在大气中都很稳定，一般小于0.00015毫米/年，在铜表面会生成一层极稳定的保护薄膜，主要是碱式硫酸铜呈橄榄绿色，还会产生氧化铜（CuO）中黑色，硫化亚铜黑色，及氧化亚锡（SnO)棕黑色，年代越久则锈层加厚颜色也变深，俗称为“黑漆古”。
说到钱币的历史，公认是由玉璧发展而来的，在没有铜币值钱就是用玉璧来做交易的，而古人认为天是圆的地是方的，所以制作了外圆内圆的玉璧用来礼天，这枚钱币外圆内方，象征天地乾坤，既有历史研究价值，也可以驱邪避恶，保平安，通体贴骨绿锈包浆，开门到代，且字迹清晰，品相完美，被称为御书钱，字体优美，具有极高的收藏价值。
英文翻译：The northern Song Dynasty monetary grand view tong Bao, is by huizong imperial title qian wen. The Song Dynasty was different from the previous dynasties. Every time a New Year number was changed, the furnace was opened to cast new coins. If the year number was heavy with bao Wen, the non-year number money was cast. In the three hundred years of the Song Dynasty, it was mainly xiaoping that folded two coins, during which there were also large sums of money in circulation, and the outline and size of coins had certain standards. So the Song dynasty money edition is very many, rare past dynasties, money in addition to true, grass, li, seal script, line, there is the Northern Song Dynasty Hui Zong "jade cut silver hook" thin gold body.
General view tongbao wide grass view
Features: The characters are slender, the characters are broad, and the part of the general character is different from that of the general character. The name of the general character comes from the long head of the Chinese character "Guan", and the right end is level with the part of "jian".
Romantic emperor chongguan, iron painting silver hook word end. Hearing that there is little copper in Sichuan, let the stubborn iron buy the land!" The poem narrated is the northern Song Dynasty hui Zong vivid thin gold body. Huizong inherited the throne in his early years, advocating calligraphy and painting art, but not good at the state. He himself was in the imperial book to personally recite chong Ning Tong Bao, Da Guan Tong Bao, politics and heavy bao, Xuan he Tong Bao back Shaanxi and other qian articles. Royal book money money exquisite, superb casting technology, for the crown of all dynasties.
The diameter of the coin is 4 centimeters, and it is ten fold specifications. It belongs to the large-denomination copper coin. The oxidation of both sides of the coin is consistent, and there is an obvious black paint ancient wrap pulp.
Black lacquer, long-term in atmospheric corrosion mechanism analysis refers to a bronze copper, bronze, brass in the atmosphere is very stable, generally less than 0.00015 mm/year, in the copper surface generates a very stable layer of protective film, mainly alkaline copper sulfate in olive green, also can produce copper oxide (CuO) in black, cuprous sulphur black, And stannous oxide (SnO) brown and black, the older the rust layer thickens the color also becomes darker, commonly known as "black paint ancient".
Said to the coin of history, is recognized by the developed jade, in the absence of copper coin is worth to do deals with jade, and the ancients think day is round the ground is square, so make the outside circle within a circle of jade to day, the coin inside the cylindrical, symbol of heaven and earth, both historical research value, can also be evil evil, to be safe, considerate bone patinas patina, open the door to the generation, And clear handwriting, perfect appearance, known as the royal book money, beautiful font, has a high collection value.
,
