咸丰铸币，名目繁多、版式复杂，为中国历代铸币之最。“咸丰三年，军旅数起，饷需支绌，东南道路梗阻，滇铜不至，刑部尚书周祖培、大理寺卿恒春、御史蔡绍洛等先后条陈钱法，请改铸大钱，以充度支。”在这种情况之下咸丰大钱终于应运而生。清朝政府开铸的大钱有当十、二十、三十、四十、五十等，其中尤以当三十着为少，且仅有宝苏局有铸造，被视为咸丰重宝大珍！“咸丰重宝”始铸当十大钱，继而又开铸当五十、当百和当百以上，并令全国各省迅速铸造推行。“咸丰重宝”铸行情况特殊，当值等次、大小轻重、铸造材质、铸造工艺、文字书体、钱文等，在各局甚至在同一局监内铸造时，都差异很大，以至有当值大小和钱体大小轻重倒置的，此外还有铁钱和铅钱。   清 “咸丰重宝”背“宝苏当五十”，正面刻有咸丰重宝四字楷体，背面满文宝苏局造当五十。字迹清晰深俊，铜材优良，钱文精美，比同版流通的钱稍大些、厚重些。当五十及以下计值称为“咸丰重宝”，高于当五十计值称为“咸丰元宝”，以区别于小平钱“咸丰通宝”。清代采用翻砂工艺铸造钱币，每当钱局开始铸币时，首先由钱局工匠手工雕刻制成祖钱（雕母），然后再以祖钱翻铸若干母钱，最后再用母钱来翻铸普通子钱。因此，雕母都是孤品，即便近似版也不可能多。母钱的制造量稍多，但经历上百年的历史变迁，现存量极其稀少。清代雕母、母钱铜质精良，制作精美，完全符合现在收藏家的审美观点。此枚宝苏局咸丰重宝当五十极为罕见，表面平整光洁，铸造工艺极其精湛，铜质更加细腻，保存完好为难得一见母币佳品. Xianfeng coinage is the most famous coinage in Chinese history. "Xianfeng three years, the military several, rates and requirements, the southeast road obstruction, yunnan copper not, the ministry of justice book zhou zupei, Dali temple secretary heng chun, the imperial secretary CAI shaoluo and so on have put forward the money law, please change the coin, in order to fully spend. In this case, xianfeng big money finally came into being. Qing dynasty government opened the casting of the big money when ten, twenty, thirty, forty, fifty, etc., especially when thirty for a few, and only the bureau of bao su casting, was regarded as xianfeng heavy treasure great treasure! "Xianfeng heavy treasure" began to cast when ten big money, then began to cast when fifty, when hundred and when hundred and more, and made all the provinces quickly cast implementation. The casting line of "xianfeng zhongbao" has a special situation, such as the order of duty, size and weight, casting materials, casting process, writing style, and qian wen, etc., all of which vary greatly from bureau to bureau, even when casting in the same bureau, so that the weight of duty and the weight of qian body are reversed, in addition to iron and lead COINS.     Qing "xian feng heavy treasure" back "bao su when 50", engraved on the front side of xian feng heavy treasure four characters regular script, the back full wen bao su bureau m