Quote from speculatus:
The specialist, floor broker, or properly coded algo strategy would never flash big/offer with that size. It must be a stale order, a typo, or someone throwing the rest of his order. I see it dozens of times in many stocks (small and mid cap), the size almost always gets a hit except open and close times, but that's a different story. And I never saw a size refresh. The specialist may post reserve liquidity of any size, but I haven't see it more that 1k. Would you show your hand?
Just FYI, I've seen specialist or floor broker reserve orders showing 10k... and sometimes when they start showing less than 10k that's the end of the order.
Usually they game it though, and continue to refresh after decrementing the display size.