Quoted: So what date did they start with the Rev F? I am trying to dig up more info on a 554 that I recently purchased and it is a Rev F. Thanks, Wj
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Rev F's started in Feb. 2004 and are still the current revision.
The change from the flat buttons to the rubber-covered buttons began with the Rev. E models.
Only the Rev. F's are indicated by the F on the hood. Previous models did not show the Revision.
If you have a sight with the rubber covered buttons, but no F on the hood, you have a Rev E.
As I previously mentioned the 554 was a one-time production run for the U.S. Army ARDEC Rapid Fielding Initiative. They were all Rev. F's and the only difference between a 552 Rev. F and the 554 was the programming of the brightness turn-on level with the down arrow button. About 6,500 were delivered on contract to the Army. I don't believe that any were released to the commercial market. It may be the case that you purchased GI property.