Thats a great looking piece, love the weathered patina, lets you know its been around and seen some things. Can I be on the DIBS list?
Was that off the 'bay by any chance? I saw that and thought "probably no one thinks it has a EP-4 caliber...", and it ended up at ~$550
Sure, you're at the top! Yes, it was on the bay, but not the $550 example you're thinking of - that's still available!