Year Of The Pig, 1994 Stamp

The 29c Year of the Pig stamp was issued 20 years on December 30, a Saturday. The first day city was San Francisco. Most post offices in the US didn't sell the stamp until Tuesday, January 2, 1995. On January 1, 1995 the first class rate was raised to 32c.

Here's an obviously philatelic cover cancelled on Sunday, December 31, one of two days that the stamp paid the first class rate all by itself.