California Dogface Butterfly USPS Stamp: State Insect & Wedding Guide

The California Dogface stamp belongs to the U.S. Postal Service tradition of butterfly designs associated with nonmachinable First-Class Mail. This guide separates the stamp’s postal purpose from its artwork and from the living species it depicts.

What the stamp is

USPS issued the California Dogface stamp on January 27, 2019, in Kansas City, Missouri, as Item 120100 in panes of 20. It is a nondenominated Non-machineable Surcharge Rate stamp: the printed words identify its rate category, so it is not a fixed-value stamp.

“5346” is the Scott catalog number, not a USPS retail item number. USPS Item 120100 identifies the pane sold by the Postal Service; naming the numbering system prevents the two identifiers from being confused.

How to use it correctly

The California Dogface pays the current named nonmachinable-letter category when the mailpiece qualifies for it. Wedding branding, decorative paper, or a butterfly subject does not determine postage. Destination, mailing date, completed weight, dimensions, thickness, rigidity, and shape control the calculation.

Square envelopes commonly trigger nonmachinable pricing, while thick or uneven contents may raise additional preparation questions. Build one complete invitation—including liner, inserts, ribbon, and seal—and have an unusual piece checked before purchasing enough postage for the entire guest list.

For a concrete example, assume a finished domestic invitation is square, uniform, no more than one ounce, and otherwise within letter dimensions. At prices effective July 12, 2026, the 82-cent one-ounce letter price plus the 49-cent nonmachinable surcharge totals $1.31, which one unused California Dogface stamp covers through its named category. If the completed invitation instead weighs 1.3 ounces, the 29-cent additional-ounce amount raises the total to $1.60.

About the California Dogface

The California dogface (Zerene eurydice) is named for the profile-like marking on the male’s forewing. California designated it the official state insect in 1972 through Assembly Bill 1834, Chapter 521; the California State Capitol Museum also notes that the species occurs only in California.

Tom Engeman created the square yellow-and-black image digitally from photographs of preserved specimens; Derry Noyes designed the stamp. The result is intentionally simplified and stylized, with “NON-MACHINEABLE SURCHARGE” printed below the insect.

Collecting and authenticity

Identify this issue by the yellow-and-black dogface profile, the square format, the printed rate inscription, and the pane of 20 described by USPS. Print color or die cutting can support comparison, but no single visible trait guarantees authenticity. For valuable material, use a documented genuine comparison and qualified expert examination.

Sources

Key facts were checked against USPS Stamp Announcement 19-05; the California State Capitol Museum state-insect record; USPS domestic mailing standards; and the Smithsonian National Postal Museum.