http://www.liveauctioneers.com/item/...-7-inch-screen
This 621, at the Elli Buk auction is the ONLY example that I have ever seen that deviates from the others. If you notice it has the "free-form" style pre-war decal on the front (all others have the post-war smaller, more block-style one). Also, a member on ARF noted that the rear badge serial number area deviates from the typical ones.
I think this was a VERY early production set. It could also stir up the controversy that the set, or some of them, were produced before the war. You have to admit, with the pre-war decal it really does look even more like a pre-war Vassos set. It's one of the more unique 621's I've seen as of yet.