Crankshaft stamping

[Ivan141]

That's odd.. almost as if someone removed the numbers.
Personally, I would just buy some decent brand aftermarket bearings, verify clearance is in spec with some plastigauge, call it a day.
The clearance using those numbers is highly accurate (assuming everything is still in spec after 30-40 years), but the bearings cost a riculous amount from Toyota dealers.
So if you're going to be ballparking it.. go with the 40 euro/dollar set, not the $300 set. Furthermore, I dont think plastigauge is anywhere near precise enough to show up
the differences in clearance those stampings make. I will be trying to build my own old 3-rib block using off the shelf Glyco bearings for the same reasons outlined above.