Key chain is available with one of two types tokens: an MBTA token or a Boston MTA token. The MTA oversaw Boston's public transit system from 1947 to 1964, when it handed operations over to the MBTA. The MBTA token was first issued in 1988. The MTA token was first issued in 1951. Key chain ring is 1.5" in diameter. Each key chain is handcrafted in Brooklyn, NY, exclusively for MBTAgifts.