well I have come up blank, no references to a breech loading rifle that fits your description any markings. if the 1966 is a date then that suggests a reproduction but in the condition was probably buried to make it age more and turn it into a fake antique rifle. if the 1966 is a serial number then it is probably a very old(pre 20th century) breech loader. my best guess would be italian.
all guns lost in a tragic smelting accident.
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