Maybe Canon website the company that manufactures the camera
I have a Model A-510 still working and it was purchased in 1981.
1035 steel....France: AFNOR CC 35Germany: DIN 1.0501Italy: UNI C 35Sweden: SS 1550United Kingdom: B.S. 060 A 35 , B.S. 080 A 32 , B.S. 080 A 35 , B.S. 080 A 37 , B.S. 080 M 36United States: AMS 5080 , AMS 5080D , AMS 5082 , AMS 5082A , ASTM A108 , ASTM A29 , ASTM A510 , ASTM A519 , ASTM A544 , ASTM A545 , ASTM A546 , ASTM A576 , ASTM A682 , FED QQ-S-635 (C1035) , FED QQ-S-700 (1035) , SAE J403 , SAE J412 , SAE J414 , UNS G10350