M390 VS S90V edge retention testing featuring the MBK Old Guard and QSP Penguin.
Reviewed by @knifepile
CPM S30V baseline for comparison
Composite 1–10 ratings from published steel testing and manufacturer data, informed by Larrin Thomas's public research. Assumes typical production heat treatment.
Specs derived from QSP Exclusive Penguin Button Lock Knife Smooth Ultem S90V listing data — verify critical details with the retailer.
At $110.00, it's priced below the median for C. Risner Cutlery LLC's lineup ($175.00 median).
The tracked price is down about 12% (from $125.00) since Drop Beacon began tracking it in April 2026.
Over the tracked window it has ranged $99.99–$125.00, putting the current $110.00 around the middle of that range.
Based on 3 recorded prices since April 2026.
Traditional Pocket Knives
Retailer
$110.00
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The QSP Exclusive Penguin Button Lock Knife Smooth Ultem S90V by C. Risner Cutlery LLC is currently priced $110.00 and is in stock. Drop Beacon tracks live prices so you can find the best deal.
At $110.00, it's priced below the median for C. Risner Cutlery LLC's lineup ($175.00 median). The tracked price is down about 12% (from $125.00) since Drop Beacon began tracking it in April 2026.
The QSP Exclusive Penguin Button Lock Knife Smooth Ultem S90V is available from 1 retailer tracked on Drop Beacon. Compare their live prices and pick the cheapest before it sells out.
The lowest price Drop Beacon has tracked for the QSP Exclusive Penguin Button Lock Knife Smooth Ultem S90V is $99.99. Full price history shows whether the current price is a genuine deal.
C. Risner Cutlery LLC
$110.00
