Stewart,

Yes, all have issue marks that are quite detailed, with the exception of the Sterile, which has one line of info. Finding a good one means navigating a bit of a minefield I'm afraid, pardon the pun. Two companies have issued modern lookalikes some sellers try to pass off as originals. But plenty of info and photos on the internet.

Good luck.

: Thanks Bill,
: That's very useful, I'm going to do some digging. Do they generally
: have issue markings on them? If so, are they commonly faked or
: any pitfalls to watch out for?

: Stewart