民国成立后，铜元仍继续大量流通使用。1914年，铜元正式改称“铜币”，民国发行的铜币与清最大的区别是龙纹被换成了由稻穗组成的嘉禾纹。各省铸造的铜元大多为两面叉的国旗图案。
1911年辛亥革命胜利后，清帝退位，中华民国成立，中国民主主义革命的先驱者孙中山就任中华民国临时大总统，并在颁布的“临时大总统令”中提出要“另刊新模，鼓铸纪念币”，随后武昌和南京两处造币厂率先铸行了 “中华民国开国纪念币”铜元辅币，以十文面值的为主，在全国大量发行以取代清朝铜元。这就是“中华民国开国纪念币” 铜元的由来。无庸置疑，这种铜元的币名很明确，就是“中华民国开国纪念币”。正面"中华民国开国纪念币"字样，正面是面值，背面交叉龙旗。
从历史的角度出发， 中华民国开国纪念币具有浓厚的历史氛围，是收藏价值不菲的革命文物，在钱币历史上具有深远的纪念意义。从考古的角度出发，开国纪念币记录了辛亥革命漫长而惊天动地的革命历史，见证了无数革命先烈的奋斗，近代中国钱币中的精品;从收藏的角度出发，随着时间的推移，“开国纪念币”的市场存量越来越稀少， 品相好的更是稀有无比，成为了钱币市场的“老珍稀”藏品。
藏品介绍
中文名称：双旗币
英文名称：Double flag currency
类别：杂项
规格：二枚
品相：美品
正面：呈双圈，外圈上置楷书中华民国四字，下置楷书开国纪念币四字，左右各一梅花，内圈双旗一边的十八星旗的外形采用了树叶状，另一面的五色条旗上的条纹可能受到当时军阀纪念币的影响而变得考究起来了：呈波浪状线条。
反面：呈双圈，外圈英文THE REPUBLIC OF CHINA TEN CASH，内圈中置楷书十文面值，稻穗组成的嘉禾纹，表面贴骨锈，锈层与器物本体浑然一体，几乎没有分离感，结实地贴在器物表面。
黑漆古
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”，若长期在手中把玩则会使表面光亮如镜俗称“传世古”。但在这类古铜中也产生电化学腐蚀，故是“哑声‘。若古铜长期在干燥的环境中（大气中或土中）也会产生氧化铜和氧化亚金星呈深黑色，俗称“黑漆古”
包浆是古玩行业专业术语，指文物表面由于长时间氧化形成的氧化层。“包浆”其实就是“光泽”，专指古物器物经过长年久月之后，在表面上形成这样一层自然的光泽。不止瓷器、木器、玉器、铜器、牙雕、文玩、书画碑拓等纸绢制品都有包浆。
包浆既然承托岁月，年代越久的东西，包浆越厚。举一个简单的例子，新买来的竹席，不论打磨得多少光滑，都不算有包浆，但老祖母睡了五十年的竹席，包浆红亮不待言说。新锄头的把柄没有包浆，老农民的锄头柄，无不包浆厚实。
它是在悠悠岁月中因为灰尘、汗水，把玩者的手渍，或者土埋水沁，经久的摩挲，甚至空气中射线的穿越，层层积淀，逐渐形成的表面皮壳。它滑熟可喜，幽光沉静，告诉人们这件东西有了年纪，显露出一种温存的旧气。那恰恰是与刚出炉的新货那种刺目的“贼光”，浮躁的色调，干涩的肌理相对照的。
我们可以看到这两枚钱币，包浆十分自然，所谓的红斑绿绣它都具备，双旗币就是青天白日旗，在当时青天白日满地红旗由青天、白日、满地红三部份组成。青天象征中华民族光明磊落、崇高伟大的人格和志气。白日象徵坦白公正、无私无我,
双旗币极其稀缺，大家都知道民国多年抗战，战争中需要大量的子弹，而制作子弹最好的材料就是民国时期的铜币，从而导致大量民国铜币被毁制作成弹壳，使目前的双旗币极为稀少。
这枚双旗币造型精美，钱币整体规整，自然氧化形成包浆，底光柔和，有贴骨锈属于开门的老钱币，专家鉴定真品无疑，其年代特征明显，极具历史研究价值，经济收藏价值极高。
英文翻译：After the establishment of the republic of China, copper continued to be used in large quantities. In 1914, the copper yuan was officially changed to "copper COINS". The biggest difference between the copper COINS issued in the republic of China and the qing dynasty is that the dragon grain was replaced by the golden harvest grain composed of rice ears. Most of the COINS minted in the provinces are two-pronged national flags.
After the victory of revolution in 1911, the qing emperor to abdicate, the republic of China was founded, China's democratic revolution pioneer sun yat-sen became provisional President of the republic, and in the "interim executive order" issued to "another issue of the new mould, drum casting COINS", then the wuchang and nanjing mint in two places first casting line "the founding of the republic of China COINS" copper coin COINS, give priority to with the face value of 10, issue instead of the qing dynasty copper coin in the country. This is the origin of the "founding coin of the republic of China". There is no doubt that the name of this copper dollar is very clear, it is "the founding of the republic of China COINS." Front "republic of China founding coin", face value, back crossed dragon flag.
From the perspective of history, the founding COINS of the republic of China have a strong historical atmosphere, is a valuable collection of revolutionary cultural relics, in the coin history has far-reaching commemorative significance. From the perspective of archaeology, the founding COINS recorded the long and earth-shaking revolutionary history of the revolution of 1911 and witnessed the struggles of countless revolutionary martyrs. From the perspective of collection, with the passage of time, the market stock of "founding COINS" is more and more scarce, good quality is extremely rare, become the "old rare" collection of the coin market.
The collection is introduced
Chinese name: double flag coin
English name: Double flag currency
Category: miscellaneous
Specification: one piece
Phase: beauty
Positive: a double ring, outer ring on the>
Reverse side: double ring, outer ring THE REPUBLIC OF CHINA TEN CASH, inner ring with regular>
Black lacquer
Bronze long-term in atmospheric corrosion mechanism analysis of 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 type copper sulfate in olive green, also can produce copper oxide (CuO) in black, cuprous sulphur black, and stannous oxide (SnO), dark brown. The older the rust layer thickened color also become dark, commonly known as "black lacquer ancient", if long in the hand will make the surface as bright as a mirror commonly known as "handed down the ancient". But this type of copper also produces electrochemical corrosion, so it is "dumb". If the copper long-term in the dry environment (in the atmosphere or soil) will also produce copper oxide and Venus oxide dark black, commonly known as "black lacquer ancient"
Coated pulp is a professional term in the antique industry, which refers to the oxide layer formed on the surface of cultural relics due to long-term oxidation. "Coated pulp" is actually "luster", which refers to the natural luster formed on the surface of ancient artifacts after years and months. More than porcelain, wood, jade, bronze, ivory, play, calligraphy and painting, such as the paper silk products are wrapped pulp.
Since the envelope bearing years, the longer the age of things, the thicker the envelope. Take a simple example, the newly bought bamboo mat, no matter how much polish, are not wrapped pulp, but the old grandmother slept for 50 years of bamboo mat, wrapped pulp red bright do not need to say. The handle of the new hoe has no wrapping pulp, and the handle of the old farmer's hoe has thick wrapping pulp.
It is in the long years because of dust, sweat, the player's hand stains, or earth buried water qin, prolonged rubbing, even the air through the rays, layer upon layer accumulation, gradually formed the surface skin shell. It is smooth ripe delectable, quiet light, tell people that this thing is old, show a kind of old air of tenderness. That is exactly with the hot new goods that kind of dazzling "thief light", impetuous tone, dry texture contrast.
We can see that these two COINS, wrapped pulp is very natural, the so-called red spot green embroidery it has, double flag coin is the blue day flag, in the blue day red flag by the blue day, day, red ground three parts. The sky symbolizes the open and aboveboard, noble and great character and aspiration of the Chinese nation. The day stands for candor, justice, selflessness,
Double flag coin is extremely rare, we all know that for years of Anti-Japanese War in the republic of China, the war needs a lot of bullets, and the best material to make bullets is the republic of China period of copper COINS, resulting in the destruction of a large number of republic of China copper COINS into shells, so that the current double flag coin is very rare.
This double flag coin modelling is exquisite, coin whole is neat, natural oxidation forms pack oar, bottom light is downy, have stick bone rust to belong to the old coin that open the door, expert appraisal is real article undoubtedly, its age characteristic is obvious, have historical research value extremely, economy collects value extremely high.
