I think the TK in the centre is a relic Belgian made skull from the 'Indian Caps'-firm. The other one is a 3-prong Assmann skull.
Can't really comment on the eagle but I think it's original aswell.
It is not to much to clean.
This skull is made from zinc but as a dug skull has zinc plaque.
You cannot clean this.
You only can clean only some black plaque from back but Im sure not all.
Peter
i agree with krikke1980 its a belgian made indian caps scull and i don't think it will help to clean i would just put vaseline over it so it won't get much worse
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