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Hey Bill, or others, that may know.

When did Win. stop marking their parts 66118 and start with
OM-N ?

Or was OM-N a subcontractor division of Win.

The reason that I ask is, my bolt and op-rod are marked with 66118 and the trigger housing and hammer are marked OM-N.
 

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The way I heard it: OM is Olin Mathison Chemical Corp and the N is a subcontractor called Nichols Precision Machining. There are also references to this if you do a search in this forum.
 

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There are many contacts from Olin. The contracts were in different locations, some in Connecticut (Winchester) and the rest in a variety of locations, depending upon what was being made. Some contracts for small arms items were located in Illinois.

How it is marked as with number or letters can depend upon the contract requirements, the way the contract is being awarded (possibly for financial reasons to which division), and a variety of other possibilities.

The question in my mind is: "Where all the parts made in Connecticut, or in a variety of locations?"

Only documentation from the past will reveal the answer.
 
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