Okay, it's a custom gun.. so doesn't really count against factory takedowns.

Seen on the internet.. Not mine. It's.. interesting. Factory takedowns were last made in 1940 (okay, a few sneaked out after that - but last catalogued in 1940), and available cartridges were 22HP, 250-3000, 303 Savage and 300 Savage.
I don't see a cartridge counter, so that means this is a post-1960 99E turned into a 3 barrel takedown set in 243, 308 and 358 with exhibition grade wood for display, and a fiberglass stock for field use.
I have to admit.. I'd love a 3 barrel set in 243, 308 and 358.

Though I might have chosen a DL or 99F as the base gun rather than a 99E. But he didn't ruin anything very collectible.

Keith raises a good question.. how did the gunsmith set it up to be a 'takedown'. Does the forearm lock the barrel in place like on a factory takedown? Or does it require a gunsmith to swap the barrels, and they are all just prefitted and indexed properly? Hmm.

Gunsmith website is here:

http://www.gostomskisgunsmithing.com/

Maybe some of our Maryland members know them? Located in MOUNT SAVAGE, MD.

Can't really tell from the pictures, but it seems like it would be simplest to use the forearm.

It may be set screwed in place at the proper index point, too. My brother has a Euro bolt like that. I can't remember the brand, but the barrels turn to a set index point, then two or three screws go through the reciever into indents in the barrel threads to hold it.

I saw them at local gun shows in the past. Haven't seen them in a while.

No big deal to swap barrels if you have a good barrel vise and an action wrench. Not particularly handy, but not difficult either.

off topic a bit, had this guy build me a 38-55 on a .303 solid frame, that is absolutely beautiful, an excellent gunsmith (Bill) for pics email "[email protected]

Gostomski always had a ton of 99's at the show's. Nice stuff, high prices. Very personable chap.

There was a thread on one of his take downs here several years ago. I looked him up based on what I read here. The article back then may have been this set? Just looked at the link. It’s the same set we discussed a couple years back.