Any Idea What This Is?

It does. It's heavy and the action is amazingly smooth. Can't find any info on it.
 
You can see them fairly often on e bay, called the #246 "Ultra Mike" Micrometer / Comparator; cost $495 in 1970 according to my Brown & Sharpe STM-5 catalog. 0-4" range direct reading to one tenth of a thou. and comparative measurements to 50 millionths. If equipped with an electronic gage head instead of the dial indicator, comparative measurements to ten millionths.
 
That is a SuperMic as stated above . Accurate and expensive too ! Nice . :encourage:
 
This unit is not a SuperMic, which is a cheaper version, and (without) the dial indicator; it is officially the Ultra Mike, as stated in the catalog.
 
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