CD 154 with light iridizing coating, mold #51 is within the mold numbers that received this type of coating. This has been seen by a few renowned WT specialist who agree this is a true iridized coating example. Insulator list for $300-350, with the lighter coating and a few pecks and scuffs, $150 shipped and insured within the continental US, others inquire. Buy with confidence. PayPal to friends and family preferred, others inquire. Reduced to $100, ask for pics in other lighting if you have interest. Thanks for looking