The Mile HIgh city is celebrating it's 150th birthday this year and the Denver Post Office teamed up with the City to help celebrate.
The commemorative envelope shown at right is available for $7, and special postmark (not shown) is also available for free until January 30, 2009.
Send your requests to:
Denver's 150th Birthday postmark and/or souvenir envelope
951 20th Street
Denver CO 80202-9998