How would one identify a Hart barrel?

[root]

Just what it says.

How do I figure out if it's a Hart? Anyone know?

[runfiverun]

all the marked ones i have seen have a small heart stamped on them near the chamber end.
i have seen lot's of aftermarket barells with no markings of any kind on them though.
i have a douglas 5-R barell on my 7x57 i.c.l. and the only way you'd ever know it is by the 5 lands and the cut of the rifling.
dunno whats on my 7x57 ackley.
my custom 25-06 has a very nice non-descript aftermarket barell on it as well,and i have a couple of others kicking about that have nothing written on them.