ROA date of fabrication.

Hello,

Could somebody help me ?
I am looking for the date of fabrication of a stainless, 7 1/2 , adjustable sights which number is just : 570 ?
There is not the prefix "145-..." as there is usually.

Thanks in advance.

late 1975. eastbank.

Treasure that sucker if you already own it.

If you don't own it, and it is priced reasonably, buy it.

And if you don't want it, let me know where it is...

Thanks for your rapid answer.

This nice old baby is at home, in France.

Do you know why the "145" prefix came later ?