This is great, my brother is a history buff and a few years ago I bought him a Hadrian coin for his birthday. I'll look through this and see if I can find something else he'd be interested in, holidays are coming up and I'm always looking for nice gifts.
EDIT: is there any way I could set up an alert for when you add some non-US currency into stock?
That's awesome and a very thoughtful gift for him! Yes I'm planning on building alerting - BUT - I'm probably not going to expand beyond US-based stuff for the foreseeable future. It's just the niche I know and even though there's a big wide world out there, I haven't spun up my brain to learn about it all yet.
If there's any country in particular you're looking for, shoot me an email. I know a ton of other dealers in the business and I'd be happy to point you to someone who might have something he'd enjoy.
EDIT: is there any way I could set up an alert for when you add some non-US currency into stock?