It's plausible that some Wreath crowns may have circulated, as you find them in really low grades, not just VF or Fine. I've seen an example which probably wouldn't even make "Fair". 
 
	In the early days of the 0.500 silver coinage I imagine a fair bit of 0.925 silver was still in circulation. If you look at the bottom grade Old Head crowns, or George V sterling halfcrowns, some of which are barely readable, this seems pretty plausible. 
 
	If people were used to accepting Victorian crowns through the first half of the 1920s, if a wreath crown popped up in 1927 or 1930 it's hard to see them rejecting it as not being current.
 
	It might be impossible to spend £5 coins now, let alone the silver £20 pieces etc. but then no-one alive today save for a few super-centenarians can possibly remember crown sized coins being in circulation. When it had been less than a decade since they disappeared from circulation it seems rather more likely that they would have been accepted.