Thats why it is interesting to me Norm, that from the observe it looks like a tombak badge, no pitting at all, also seeing some tombak colour on the worn spots, but I know the set up was used on zinc examples.
It's in extraordinary condition! There are a few zinc bubbles between the chain links and just above the anchor but it's probably the best set I can remember seeing.
Thank you for the additional pics Damien, much appreciated.
Looking for LDO marked EK2s and items relating to U-406.....