Pryor supply a full range of single metal letter and number stamps, so if you only need a few characters, you can buy them from here
Low stress metal stamps available as single items.
Marking stamp - Pryor Premium - Pryor Marking Technology
Buy Hand Stamp Sets, Letter & Number Stamps
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Low Stress Metal Stamps- HandTools by Pryor
Quality Steel Stamps
Pryor PPMS10050 09 Round Face Lowstress Punches, 10 Piece, 3/16, 5.0mm: : Tools & Home Improvement
Low Stress Punch Sets - Pryor Hand Tools
Pryor Hand Tools, Sheffield
Type Stamps - Low Stress
Pryor Hand Tools on LinkedIn: #numbering #marking #serialnumbers #batchnumbers #datecodes
Steel Hand Stamps - Low Stress Punch Sets
General, 3/16 Character Steel Stamp Set – Letters & Figures