From Slots to Studs: A Collector's Guide to the First LEGO® Bricks (1949–1960)
Every LEGO® brick you snap together today traces back to a small, slotted block released in postwar Denmark. In just over a decade, that early brick evolved from a cardboard-friendly building toy into the precisely engineered, tube-clutched brick we still recognize. If you love spotting the tiny details that separate one era from the next, here's how the earliest LEGO bricks changed year by year—and what to look for.
1949: The Automatic Binding Bricks
The story starts in 1949 with set 700 – Automatic Binding Bricks. These were slotted bricks, designed so you could slide in windows, doors, and even cardboard walls.
The very first Automatic Binding Bricks carried no LEGO logo or markings at all. Their design was based on the British Hilary Page Kiddicraft bricks, first released in 1945, and LEGO produced them in a wide range of colors and shades.
To learn more about Kiddicraft Bricks and to purchase them, click here.
The earliest examples were molded from a catalin-type resin, which is worth knowing if you're hunting for pieces in good condition. This resin doesn't warp, has a shiny finish, and shows a distinctive milky quality—so these bricks tend to survive in noticeably better shape than the pure cellulose acetate bricks that followed. Cellulose acetate remained in use for later Automatic Binding Bricks until ABS (Acrylonitrile Butadiene Styrene) took over in 1963.
One way to identify LEGO bricks without the logo from this time period is to note the inside corners of the brick are more rounded than other manufacturers.
Look for: 2x2 and 2x4 sizes, either single slotted or opposite slotted.
1952: The LEGO Name Arrives
In 1952, "LEGO" appeared for the first time—in block letters on the inside bottom of the brick. On the interior, the ribs run along the long side of the brick and the inside corners went from rounded to squared.
This is also the year the LEGO logo first showed up on packaging, paired with the word Mursten, Danish for "brick."
Look for: 1x2, 2x3, and 2x4 sizes in white, red, light and dark green, blue, transparent, and marbleized blends of various colors.
1953: Mold Numbers and a Rib Switch
In 1953, mold numbers were added beside the LEGO name, and the interior ribs switched to run along the short side of the brick.
Here's a fun quirk for collectors: this mold didn't include mold numbers right away—they were added later—so you can find bricks from this mold both with and without numbers, all sharing that short-side rib pattern.
Look for: 1x2, 2x2, 2x3, and 2x4 sizes in white, red, yellow, green, blue, and transparent, available single slotted, opposite slotted, and with slots on the side of the brick.
1954: The "Dogbone" Logo
In 1954, the italicized "dogbone" LEGO logo was added to the underside of the bricks. The logo still hadn't made it onto the tops of the studs yet—but there's a telltale sign from this era. Two studs at opposite ends sit slightly differently from the rest, with higher sides or a sunken middle. That's a fingerprint left by the ejector pins used in the molding process.
Look for: 1x2, 1x6, 1x8, 2x2, 2x3, and 2x4 sizes in white, red, yellow, dark green, blue, and transparent.
1956: Logo on the Studs
In 1956, the LEGO logo finally landed on top of the studs. Flip one of these bricks over and you'll see hollow studs with no tubes or walls on the underside.
Look for: 1x2, 2x2, 2x3, 2x4, 2x8, and 2x10 sizes in white, red, yellow, blue, green, and transparent.
1957–1958: The Tube That Changed Everything
In 1957, tubes were added to the underside of the brick—the innovation that gave LEGO its famous clutch power and made stable, satisfying builds possible.
The patent for this tube design was filed at the Danish Patent and Trademark Office in Copenhagen at exactly 1:58 p.m. on January 28th, 1958. That's the iconic patent drawing you've seen on countless posters and t-shirts.
The new tube brick didn't arrive alone. LEGO also released the 45° sloped brick for roofs, along with redesigned doors and windows. And to put the era in perspective: by 1958, LEGO employed 140 people and had just gotten its first photocopy machine at its headquarters in Billund.
Cross-supports for the tubes did not arrive until 1985.
Look for: 2x2, 2x3, and 2x4 sizes in white, red, yellow, blue, and transparent.
1960: A Refined Mold
In 1960, a new mold arrived with smaller stud hollows than the 1957 version. These hollows also show a ring around them, once again left behind by the ejector pins—one more small detail for sharp-eyed collectors to spot.
From a slotted block with no name to a precision-engineered brick with clutch power, the first eleven years of the LEGO brick laid the foundation for everything that came after. Next time you're sorting through a vintage lot, check the ribs, the slots, the studs, and the underside—each one is a little timestamp from LEGO history.
