Hi Joe,

It's Frederick Post Co., Chicago, Ill., established 1921 and bought 
out by Teledyne about 1970. They sold drafting, slide rules, surveyors 
supplies, much like Aloe,  Dietzgen, Keuffel & Esser, etc.

Hope this helps,

Dan Weinstock
Geneva, NY
weindan@h...

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jneustein@p...  wrote:

"I just picked up a hand sighting level in a leather case.  The level is
marked Dieterich Post Co.  Does anyone know anything about this company?  
[I bought it partly because it's cool and partly because Dieterich is my 
wife's maiden name.]

Joe"