You say, giving me undeserved credit, "You have a lot of knowledge, let it flow... ". I am pretty much unable to distinguish a well made fake glass marble from the original; actually, I developed a reputation for having more dollars than sense. That's why I tend to collect glass marbles in labeled, original boxes with a good provenance.
You say "I can't recall one informative post from you that talks about how to identify real or reproduction marbles or medals". There are others much better skilled and qualified to do that on the boards - I tried several other ways to educate collectors - mostly by buying mimics from the source and reselling online, described as such. But that backfires when the marbles get resold as rare and genuine, e.g. a $20 one inch red road and tunnel slag for several hundred dollars, or a $40 green glass eagle sulphide as a German antique, for several thousand dollars, or $40 sets of forty Chinese handmade marbles (with Marble Alan's cooperation) resold as German swirls.
Sending Mark Chervenka of Antique & Collectors Reproduction News a group of genuine and repro medals, as well as contributing information on California sulphides, from which he published a couple excellent articles, may be my most effective "educational" contribution.
I have a fairly large collection of modern reproductions. This thread was originally from Steph on behalf of Martin Bowling looking for some of Scott Patrick's onion lutzes. I had a few. I also have every shamrock marble bought from you - your $1 marbles were just as useful to me as your regular priced marbles - I obviously was not buying defective (or regular priced) marbles to fool anyone. But am still scratching my head as to why you got so upset when I told you my intention of selling (your better marbles) on eBay, especially after you'd spent the better part of the day expertly demonstrating your machinery and how exotics are made.
Finally, you ask "What have you been up to? ". The answer is not much. Been out of touch with the repro world for probably a decade; with some exceptions, one being a box of Kelly Schmidt guineas, at least half of which I cannot tell from a genuine guinea, but continue to examine them, to educate myself as well as to admire them.