I can confirm that Turnbull offered a 10% discount on total restorations in exchange for stamping a small capital D with a T inside it on the action. This was in the early 2000's. Mine was an LC Smith Trap Grade and the stamp appeared on the water table (or action flats if you prefer). I always thought it was appropriate as a way to value the restoration and prevent it from being marketed as original. JMHO.
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