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

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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
Case Tested XX Knife, 1920,1940, Vintage
eBay
$695.00
Case Tested XX Knife, 1920,1940, Vintage
VINTAGE CASE XX TESTED USA knife 1920-1940 CHRISTMAS TREE TADPOLE RARE ITEM
eBay
$295.00
VINTAGE CASE XX TESTED USA knife 1920-1940 CHRISTMAS TREE TADPOLE RARE ITEM
Vintage Case Tested 1920-1940 Knife Very Very Nice 63087
eBay
$585.00
Vintage Case Tested 1920-1940 Knife Very Very Nice 63087
RARE VINTAGE CASE TESTED GREENBONE JACK KNIFE 6216 1920-40 "SUPER NICE!!
eBay
$595.00
RARE VINTAGE CASE TESTED GREENBONE JACK KNIFE 6216 1920-40 "SUPER NICE!!
Vintage Case Tested knife 1920-1940 Stockman Knife 6218 very nice White Handle
eBay
$400.00
Vintage Case Tested knife 1920-1940 Stockman Knife 6218 very nice White Handle
Vintage Case Tested XX 2 Blade Pocket Knife 1920's - 1940's ~ SUPER NICE KNIFE!
eBay
$330.00
Vintage Case Tested XX 2 Blade Pocket Knife 1920's - 1940's ~ SUPER NICE KNIFE!
1920s Case Tested XX 3 Blade Stag Folding Pen Knife
eBay
$270.00
1920s Case Tested XX 3 Blade Stag Folding Pen Knife
Case Tested 1920-40 Rogers Bone 62042 not mint but very nice
eBay
$300.00
Case Tested 1920-40 Rogers Bone 62042 not mint but very nice
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)
1920S Case Tested Xx Rough Black Three Blade Whittler Nice!!
eBay
$163.00
1920S Case Tested Xx Rough Black Three Blade Whittler Nice!!