My Dear Mogorilla-
yes, I concurr ( as if consesus is required lol ) it is a shotgun primer anvil.
I have seen it's like amongst the used primers I save.
Being a
cheap barstich frugal sort, I have been known to save "anything" wood or metal, especially if it was previously manufactured. I am still saving a coffee can full of small carbon steel cutoffs :-) , but I do draw the line at metal shaving and swarf
( owww! ) :-(
By taking junk apart and perusing it, I found it interesting to discover that the apparrently "large" 209 shotgun is merely a
large cup holding a more "standard size" primer and this large anvil.
see here
why did I tear them apart? the dearth of .22 rimfire. I found this, using 209 primers to propell pellets
then I experimented and found a 209 primer will propell a well-lubed .22 bullet accurately out of an old .22 rifle barrel like a CB
and that a 209 will propell a well-lubed 150 gr lead bullet
quietly out of a .30 rifle ( kinda a "blooper load" - I could see the bullet!)
You really need to take more crap apart!
yhs
prof marvel