HomeNumismatic TermsSWIMS Serial Number - Ambigrams on U.S. Paper Money

SWIMS Serial Number – Ambigrams on U.S. Paper Money


A SWIMS serial number is a type of so-called “fancy” serial number found on United States paper money that appears identical if read upside down and right side up. It is also known as a “flipper”.

An example was featured in Cool Currency! Episode #1, as seen below.


* * *

CoinWeek Notes
CoinWeek Notes
CoinWeek Notes presents expert analysis and insights from Charles Morgan and Hubert Walker, the award-winning editors of CoinWeek.com.

Related Articles


Please enter your comment!
Please enter your name here

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Bullion Sharks Silver

AU Capital Management US gold Coins

Blanchard and Company Gold and Precious Metals