Not every old brick is a historic one, and telling the difference matters for a restoration project. A genuinely rare or convict-era brick carries physical evidence of its age specific marks, dimensions and manufacturing traces that a mislabelled modern brick simply doesn’t have. This guide covers how to identify a genuinely historic brick, where to look for one in Australia, and the red flags on marketplace listings that claim more than they can prove.
How to Identify a Genuinely Historic Brick
Frog marks
The “frog” is the indentation pressed into one face of a handmade brick. From the 1820s, government-made bricks in NSW were marked with a broad arrow to prevent theft by convict labourers; by the 1830s, playing-card symbols hearts, diamonds, spades and clubs were used to identify individual brickmakers, according to Museums of History NSW. Finding one of these marks on a salvaged brick is a genuine sign of colonial-era origin, not a modern reproduction.
Dimensions and texture
Pre-1850 sandstock bricks are generally smaller and shallower than later production, and the surface shows a distinctive hand-scraped or “elephant skin” texture rather than a uniform machine finish. The NSW Migration Heritage Centre’s Fairfield Museum collection documents typical convict-era sandstock dimensions and construction detail if you want to compare a find against a verified reference.
What a fake or mislabelled brick looks like
Uniform colour with no natural variation, sharp machine-pressed edges, or a frog mark that looks stamped rather than hand-impressed are all signs of a modern brick being sold as “vintage” or “historic.” If a seller can’t explain the mark or the brick’s origin, treat the historic claim as unverified.
Where to Look for Rare and Historic Bricks
Specialist salvage suppliers
A supplier that sorts stock by era and type, rather than selling a mixed pallet, is your most reliable source. See our guide to choosing a reclaimed brick supplier for what to ask before buying.
Demolition sites and community tip-offs
Heritage buildings scheduled for demolition are one of the best sources of genuinely rare brick, but you need the site owner’s or demolisher’s permission before removing anything. The Brick Pit’s Brick Rescue community program pays a finder’s fee for tip-offs on brick buildings being demolished, and partners with contractors directly so bricks are rescued before they’re crushed a more reliable route than approaching a site independently.
Online marketplaces
Facebook Marketplace and Gumtree do turn up genuine finds, but claims of “1800s” or “convict” bricks aren’t always accurate. Ask for close-up photos of the frog mark and edges before travelling to inspect in person.
Verifying Provenance for Restoration Use
For heritage-listed properties, documented provenance often matters as much as visual authenticity council heritage officers may ask for evidence of a brick’s origin, not just its appearance. Our heritage home restoration guide covers how heritage listing affects material choices, and our guide to ethical and legal sourcing covers how to confirm a brick was legally removed from its original site.
Frequently Asked Questions
How do I know if a brick is truly historic?
Look for hand-impressed frog marks (broad arrows, hearts, diamonds, spades, clubs), irregular hand-scraped texture, and dimensions consistent with pre-1900s production. A stamped, uniform mark on an otherwise machine-perfect brick is a red flag.
Are historic or convict-era bricks more expensive than standard reclaimed stock?
Usually, yes. Rarity and documented provenance both add value, particularly for verified convict-era sandstock.
Can I use rare historic bricks structurally, or only decoratively?
It depends on condition. Have any brick intended for load-bearing use assessed for structural soundness regardless of its age or rarity.
Sourcing Rare and Historic Bricks
Since 1975, The Brick Pit has rescued and catalogued reclaimed brick from heritage demolitions across Australia, including genuine convict-era sandstock. Browse our sandstock brick range or get in touch with photos of a find if you’d like help authenticating it.
