The four keys are:
1. Grade 1 (they made grades I, II, III, VI and VI.
2. 85% (100% is about $400).
3. Able's Price: $559.99 List price - not wholesale.
4. Made in 1976 - in Japan by Miroku.
This is not made in the F.N. Belgium plant (where the term "Belgium Browing" comes from).