1920-40 marks a period of very high quality pocket knives and ingenuity for the Case brand.  Many of the patterns that would thrive into the next 50 years would come from this most important era in the company’s history.  The “Tested XX” trademark was officially registered in 1905 by Jean Case of the Case Brothers Cutlery Co of Springille, N.Y.  In 1914, Jean sold the rights of the Tested XX trademark to J. Russell Case of W.R. Case & Sons Cutlery Co for the sum of $1500.

Case Tested XX Pocket Knives
1920-40 Case Tested XX pocket knives

The stamp from the 1920-40 era features a large circle C that extends underneath the “ASE” in Case.  Underneath this were the words, “Tested XX.”  The shields on the handles from the Tested era feature a “closed” C in the word Case.  After 1940, most of the shields had an “open” C.

The bone and stag handles from this era are remarkably striking as well.  These Case Tested XX pocket knives are scarce and highly sought after by collectors today including the large cigar, large stockman and large congress knife.  Check out my Case knives page and Remington knives page as well.

I appreciate any traffic from these links as I earn commission when an item is purchased, at no extra cost to you. THANK YOU!!!   – Jesse, oldpocketknives.com

Case Tested 1920-40 Rogers Bone 62042
eBay
$415.00
Case Tested 1920-40 Rogers Bone 62042
-15%
vintage Case Tested Knife 1920-1940 slick Black Excellent Condition 2231 sab
eBay
$335.75 $395.00
vintage Case Tested Knife 1920-1940 slick Black Excellent Condition 2231 sab
1920s Case Tested XX Beautiful Bone Handled Cigar Knife Very Nice
eBay
$225.00
1920s Case Tested XX Beautiful Bone Handled Cigar Knife Very Nice
Case Tested 1920-1939 Scarce W1216 Unusual Wire Jack Knife Complete w/Insert
eBay
$248.00
Case Tested 1920-1939 Scarce W1216 Unusual Wire Jack Knife Complete w/Insert
Case Tested 1920-1939 Scarce 6206-1/2 Nice Discontinued Small Jack Knife
eBay
$102.50
Case Tested 1920-1939 Scarce 6206-1/2 Nice Discontinued Small Jack Knife
-15%
vintage Case Tested Knife 1920-1940 yellow STOCKMAN KNIFE 6333
eBay
$318.75 $375.00
vintage Case Tested Knife 1920-1940 yellow STOCKMAN KNIFE 6333
Vintage Case Tested 1920-1940 Pen Knife Good Condition
eBay
$130.00
Vintage Case Tested 1920-1940 Pen Knife Good Condition
-15%
VINTAGE CASE TESTED XX 2217 2 BLADE SLICK BLACK HANDLES 1920-1940 KNIFE
eBay
$255.00 $300.00
VINTAGE CASE TESTED XX 2217 2 BLADE SLICK BLACK HANDLES 1920-1940 KNIFE
1920-30's CASES TESTED "Scarce" Green Bone STAG RARE Hunting Knife
eBay
$285.00
1920-30's CASES TESTED "Scarce" Green Bone STAG RARE Hunting Knife
-14%
Case Tested XX Slick Black 2 Blade Regular Pocket Jack Knife Vintage 1920s - 40s
eBay
$165.71 $194.95
Case Tested XX Slick Black 2 Blade Regular Pocket Jack Knife Vintage 1920s - 40s
Vintage CASE TESTED XX 3-Blade Stockman Pocket Knife Jigged USA 1920-1940
eBay
$199.95
Vintage CASE TESTED XX 3-Blade Stockman Pocket Knife Jigged USA 1920-1940
1920s/40s Vintage Case Tested XX Split Back Folding Pocket Knife (3380)
eBay
$150.00
1920s/40s Vintage Case Tested XX Split Back Folding Pocket Knife (3380)