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Determining Old Postcard Sizes: A Comprehensive Guide

By Gabriel Aug 06, 2026
Determining Value of Vintage Postcards | Vintage Southern Picks
Determining Value of Vintage Postcards | Vintage Southern Picks

Ever browsed through an antique shop or perused an online auction, only to be bewildered by the term "old postcard"? The size of old postcards may seem enigmatic, but understanding their dimensions provides a fascinating glimpse into postal history. Let's delve into the world of vintage postcards and familiarize ourselves with their sizes.

Determining Value of Vintage Postcards | Vintage Southern Picks
Determining Value of Vintage Postcards | Vintage Southern Picks

A plethora of old postcard sizes exist, each with its unique charm and connection to history. Understanding these sizes not only helps collectors preserve and display their treasures but also aids in dating and appreciating these keepsakes. Let's explore the most common and noteworthy sizes.

Where to Find Old Postcards
Where to Find Old Postcards

Standard Old Postcard Sizes

The first standard size for postcards was introduced in the late 19th century. Known as the "Penny Post" or "Penny Postcard" size, it measured approximately 5.5 x 3.5 inches (140 x 89 mm). This size was dubbed 'standard' due to its widespread use and is still popular among contemporary collectors.

How Do I Find the Value of Old Postcards? (History & Types)
How Do I Find the Value of Old Postcards? (History & Types)

However, postcard sizes were far from uniform during the so-called "Golden Age" of postcards (roughly 1890s to 1910s). Due to the lack of standardization, old postcards could measure anywhere between 3.5 to 4.25 inches in width and 5 to 6 inches in length. This diversity resulted in a unique aesthetic charm that characterizes vintage postcards.

Penny Postcards

two old postcards with writing on them
two old postcards with writing on them

Introduced in 1870, Penny Postcards were designed to be small and lightweight to reduce mailing costs. At about 3.5 x 5 inches (89 x 127 mm), they were affordable to produce and send, making them incredibly popular. Although slightly smaller than today's standard postcards, their significant role in postal history makes them cherished items to this day.

Moreover, their small size catered to the decorative tastes of the period. Recipients would often display them in picture frames or albums, turning personal correspondence into exquisite artwork.

Undersized Postcards

20,000+ Free Old Postcard & Postcard Photos
20,000+ Free Old Postcard & Postcard Photos

While the term "old postcard" usually conjures images of square or rectangle cards, some vintage postcards were considerably smaller. So-called "undersized" postcards measured around 2.5 x 3.5 inches (63 x 89 mm). Despite their diminutive size, they pack remarkable detail and are highly sought after by collectors.

Initially used for greeting cards and postcards in the late 19th century, undersized postcards continued to be popular throughout the early 20th century. They were often printed in color, showcasing intricate illustrations and vibrant images.

Collectible Old Postcard Formats

The end of the Thousand Postcard Project: thoughts about art for art's sake — Naomi Loves
The end of the Thousand Postcard Project: thoughts about art for art's sake — Naomi Loves

Beyond the standard rectangular format, old postcards offer a multitude of shapes and sizes that captivate collectors worldwide. Two such formats are especially noteworthy: Tray and Souvenir postcards.

The Tray postcard, measuring approximately 3 x 5 inches (76 x 127 mm), was designed to fit into a card index file, or tray. This clever format allowed collectors to easily organize and display their postcard collection.

Most Valuable Vintage Postcard Designs You Should Never Throw Away
Most Valuable Vintage Postcard Designs You Should Never Throw Away
Free Postcard Ephemera Sheets
Free Postcard Ephemera Sheets
some old postcards have been placed on top of each other in the same frame
some old postcards have been placed on top of each other in the same frame
four photos with the words 6 months of postcrossing - 64 postscards and counting
four photos with the words 6 months of postcrossing - 64 postscards and counting
Enlarging a Postcard, 75th Anniversary of VJ Day - Scavenger Chic
Enlarging a Postcard, 75th Anniversary of VJ Day - Scavenger Chic
15 Most Valuable Vintage Postcards: Complete Value Guide
15 Most Valuable Vintage Postcards: Complete Value Guide

Tray Postcards

Introduced in the late 1890s, Tray postcards were particularly popular in America. They featured a decorative border and a blank area at the bottom for writing messages. While not significantly different in size from the Penny Postcard, Tray postcards are distinguishable by their unique shape and divisibility.

That's right — Tray postcards were usually printed in a manner that allowed them to be divided into smaller, double-sized postcards. This ingenious design further expanded their collectibility and display possibilities.

Souvenir Postcards

At the opposite end of the size spectrum, souvenir postcards could be quite large. Measuring around 6 x 9 inches (152 x 229 mm), these descriptive keepsakes offered travelers and holiday-goers an attractive, detailed memento of their visits.

Souvenir postcards often showcased scenic views, historical sites, or local landmarks. With their increased size and high-quality printing, they provided ample space for intricate illustrations and educational descriptions. Today, they remain valued collectibles, offering insights into the history and culture of various locations.

In conclusion, the sizes of old postcards paint a vivid picture of postal history, reflecting changes in technology, design, and communication practices. Whether you're a seasoned collector or a curious enthusiast, understanding these sizes entities you to appreciate the rich tapestry of postcard lore.