My guess is late 1700s early 1800s. There is a small piece of iron missing that Im pointing to in the last picture otherwise this is an excellent condition. The item "Antique Heavy Fancy Lady Hand Ball Door Knocker Cast Iron From Columbia" is in sale since Sunday, April 26, 2020. This item is in the category "Antiques\Architectural & Garden\Hardware\Door Bells & Knockers".
The seller is "snoweycigar" and is located in Arlington Heights, Illinois. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Bangladesh, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Nicaragua, Peru, Pakistan, Paraguay, Viet nam, Uruguay, South africa, Colombia, Barbados, Bermuda, Cayman islands, Sri lanka, Maldives, Oman, Reunion, Ukraine.