Usually, state geocoins are designed and produced by geocachers associations from each state.
Also, usually these coins have a Custom Code Prefix, the abbreviation of the state they represent. (IA Iowa, WA Washington, etc...) The first state coins were those of Texas (2002), Oregon and Kentucky (2003), the last was South Dakota (year 2012). The first state coins had some similarities to each other. For example, Texas 2003, Oregon 2003/2004, California 2004 (as the USA 2003), are the only ones with the official logo on the back.
In this Blog you'll find other related geocoins.
Click on the pics to enlarge
Oregon 2004
Second
State Geocoin
Trackable
at log4.us/oregon
1000
minted
Ø 1.5” (38mm)
3mm
24g
Finishes:
Solid
Copper LE 1000 Designed/Managed by Bazzle
Vendor: Pressed Metal
Products (www.pressedmetal.net)