This was done with the concentrated vinegar and hydrogen peroxide soak. The dates are faint but readable. Will drop some cold blue on the dates one day bring them out a little more.
None of these had a visible date. The v nickels are 1888 and 1884. The Buffs are 1917, 1919s, 23. The backs of the V's gone but a readable date. No harm no foul. Slugs saved.