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WRT my earlier post, an LM385BZ-1.2G is also an inexpensive alternative.  75 cents each at mouser.   I sure wish they made these back when I was in school!

Anyway, you can thank my buddy Pete for the suggestion.  He's an engineer with a instrumentation firm.  I only test load cells and piezo amplifiers for a defense contractor.

Taylor V

Has anyone considered using the ICL8069?  It's an LM313 clone, made by Intersil and Maxim.  Same 1.2V reference, just in a plastic package.  I first ran into them in college - used them as a reference for a scratch-built A to D converter for a 300 level class.   

For a true LM313H clone, look at the ICL8069 in the "DCS" package, a mil 2 pin metal package like tubeman has in his pix.  Racal Dana and Fluke used them by the butt loads in their DMM designs in the 80s.  I've got a used one from a fluke meter - part number 508259.   IIRC, Racal used the D package with the MIL burn-in designator.

Might be an easier find.    Also keep in mind that National Semi used a LM1XX = Industrial/Mil (tight!), LM2XX=Industrial, and LM3XX=Commercial/Consumer Goods system.  With that, the LM113H and LM213H are also alternates that could be used if found....

Hope this makes sense!

Taylor V