Unknown Bolt?

[FTD1167]

Got a bolt in a NPM, don't have a clue what it is.
It has an "X" on top and a H on left lug.

Information

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[Mike in NC]

This is an IBM bolt. There probably is or was the marking "AOB" on the outside of the right lug. It is often very faint and may almost disappear after being refinished.

[FTD1167]

Thanks Mike, How about a "LT" trigger and a "HR" trigger?

[BrianQ]

How about a "LT" trigger and a "HR" trigger?

Ludlow Typograph Co
H&R Machine Mfg Co

[604flyer]

LT is a wartime replacement trigger and HR was seen in IBM. HTH