Antique Tools Identification: Marks, Age and Value

To identify an antique tool, find its maker first and its job second: look for a stamped name, initials or patent date on the blade, shaft, metal fittings or handle, then work out what the tool did from its weight, its moving parts and where it is worn. LoveToKnow's identification guide follows the same order and adds a first check that is easy to skip: make sure the object is a whole tool and not a part. Holes, screws and patches of uneven wear often mean it was once attached to something larger.

Work through these checks with the tool in good light:

• Is it complete? Bolt holes, unfinished faces and wear that stops abruptly suggest a part, such as a plane blade without its body.
• Light or heavy duty? A small, fine tool points to jewellery, clock or leather work; a heavy one to blacksmithing, farm or timber work.
• How does it move? Cranks, screws, jaws and hinges tell you whether it cut, clamped, bored or measured.
• What is it made of? LoveToKnow lists cast iron, worn wood and glass as signs of an older tool, and stainless steel and plastic as 20th-century materials.
• Where is it worn? Wear shows where hands held it and which edge did the work. Leftover sawdust points to woodworking; fine metal filings to metal or jewellery work.

A stamped maker's name is the single most useful clue, because it lets you look up the firm's working dates and catalogues. LoveToKnow suggests checking blades, shafts, metal parts and handles for a manufacturer's name or initials, and searching any patent number at the US Patent and Trademark Office.

Remember that a patent date is the earliest possible date, not the year the tool was made. Makers kept casting or stamping the same patent date for years, so a plane marked with an 1870s patent can be decades younger.

Stanley bench planes are dated with a type study, a list of the small changes the company made between 1867 and 1967. The Hyperkitten dating flowchart starts with the cast iron bed, because it has many clear markings and was rarely replaced. The first question is how many patent dates are cast into the bed behind the frog, towards the rear handle:

• No patent dates: types 1 to 8 or 15 to 20. A raised ring cast in the bed to seat the front knob separates types 15 to 20 from types 1 to 8.
• One patent date: types 13 and 14.
• Two patent dates: types 9 and 10.
• Three patent dates: types 11 and 12.

After the bed, the flowchart looks at whether the size number is cast into the bed, then at the lever cap and the depth adjuster nut. A plane assembled from parts of different types is common, so check each part rather than trusting the first match.

Disston saws carry a brass medallion on the handle, and the Disstonian Institute's medallion reference dates each design. The main brackets are:

• 1840s to 1850s: eagle in flight medallions with split nuts.
• 1865 to 1871: the rare one-son medallion, used only briefly.
• 1871 to 1875: Disston and Sons medallions, still with split saw nuts.
• 1876 to 1877: the first medallions fixed with cap screws instead of split nuts.
• 1878 to 1888: stars flanking the keystone.
• 1896 to 1917: the period that accounts for about 90% of surviving collector saws.
• 1917 to 1940: simplified DISSTON branding; after 1928 model names carry a D prefix.
• 1940 to 1947: medallions marking the company's centenary and US manufacture.
• 1947 to 1953: the last medallions of family ownership before the H.K. Porter takeover.

Most old hand tools sell for tens of dollars; the ones that reach thousands are rare planes, especially patented metal planes and early plow planes. At Brown's fine tool auction of 5 April 2008, reported by Antiques and The Arts Weekly, 748 lots made $447,309, an average of $598 a lot. The top prices went to planes:

• Ohio Tool Co. center-wheel plow plane in ebony with ivory tips: $29,150.
• O.R. Chaplin No. 1/2 smooth plane: $28,600.
• Bundy combination match and plow plane, patented 1870: $19,800.
• L. Bailey Series C split-frame jointer plane: $18,700.
• Millers No. 50 cast iron plow plane: $16,500.
• E.W. Carpenter handled plow plane: $12,100.
• Rodier patented bull-nose block plane: $11,880.
• James Silcock plow plane with brass maker's label: $2,640.

The all-time record, according to Brown Tool Auctions, is $114,400 for a Sandusky Tool Co. ebony and ivory center-wheel plow plane made in 1876 and sold by Brown Auction Service in 1995.

For everyday collector tools, Jim Bode's value guide showed these prices on sold items when we checked it on 25 September 2026: a Bailey Victor No. 12 adjustable block plane at $395, a Stanley No. 12 scraper plane at $125 and a Thackery rosewood infill shoulder plane at $150. The guide gives no sale dates.

Jim Bode's antique tool guide sorts its stock into the groups collectors use, which doubles as a checklist of old-fashioned tool types:

• Planes: bench, block, shoulder, plow, moulding and scraper planes.
• Chisels and carving tools.
• Braces and drills: the hand-cranked brace and bit came before the electric drill.
• Saws: hand, back and frame saws.
• Axes and adzes, and timber-frame tools such as broad axes and slicks.
• Measuring tools: rules, squares, levels and gauges.
• Knives and hammers.
• Blacksmithing tools: tongs, hardies and swages.
• Leatherworking and bookbinding tools.
• Medical tools and miniatures.

LoveToKnow adds bench vices, pliers, sledge hammers and hand drills to the everyday tools people most often inherit.

• A maker's name you can look up, especially on a plane or saw. Unmarked tools are harder to sell.
• A patent or unusual mechanism. Brown's 2008 sale was led by patented metal and transitional planes.
• Early construction, such as ebony, ivory or brass fittings, or a Disston medallion from before 1896.
• Complete and original. A plane with its own blade, lever cap and handles is worth more than a parts plane.
• Condition. Surface rust can be cleaned, but cracks in castings, broken handles and ground-down blades cut value.

Do not sand, repaint or regrind a tool before you know what it is; collectors pay for original surfaces.

Photograph the whole tool from the side and from above, then take close shots of any stamp, patent date or medallion in low side light so the letters throw shadows, and one of the most worn area. AntiqLens can suggest the tool type, maker and period from those photos. Check the result against the patent-date and medallion clues above before you price it.

Research and drafting for this page were assisted by AI and checked line by line against the sources listed below. Prices are copied from the named auction house, dealer or guide with the sale date where the source gives one and the date we checked it; asking prices and estimates are labelled as such, and where a figure could not be confirmed we say so rather than estimate. If you find an error, tell us and we will correct it.