thanks people...I found this some years ago...I have posted it on treasurenet, also, some years ago.
I had thought it was Navajo...since it was close to the rez...
but...not one Navajo I showed this to was impressed at all...not a word.
I researched the weight, size, method of forming an stamping...
I personally believe it was beat out on a rail road track...over a small fire...many years ago...close to 1900...
the slots are reminiscent of an early Navajo method to open a concho for mounting...
the slots were cut with a chisel in the early days...D shapes being the earliest form of Navajo...
then came the ovals and fine saw blade or pre formed punch...
the decoration stamps were normally hand made until the 1920's...center punch or old chisel being the stock used to create the pattern.
this piece shows both hand formed stamps, and factory punch. close review of the {water}bird stamp will show irregularities in the stamping.
I did have an couple of apache ladies see me with it one day and began chittering on about it...only giving me some indication of what it represented.
thanks for the response.