Hetata
1
Why does one monopoly race car that i found at a flea market have the number 3 on the cowling behind the drivers seat?
yabob
2
Apparently because it was made before some point in the 1960s:
http://www.monopoly-history.com/tokens.php
WAG - it simply has a number on it because race cars have numbers on them, and the token designer liked 3.