There was another 621 on eBay shortly after this one, it was a complete rotted disaster but the front mask was intact. It also went for around $200 I think, the mask would have been worth that by itself I think.
http://www.ebay.com/itm/1940s-RCA-62...p2047675.l2557
I was tempted since it was near me, if the CRT was good that would be worth another $200.