Thanks everyone,

The serial number and vapor finish makes it clear that this was a dash 5 gun (I have a dash 6 and it has a frame mounted FP).

But I have trouble seeing the possibility that the - 5 was just off the crane. One's I've seen with various dashes always had the ‘Mod.’ above the series number when there was a dash leaving enough room below for the whole number.

Sort of makes me wonder if maybe the crane was replaced.

Probably not but it would be interesting to see if others appear like this.

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