Bingo.
It's a different action, but the same stock, the stock is mid '60's and the action is 1980.
I wonder what happened to the original action....That serial number 163320 didn't appear on any other HW55's at that auction.
Was there much difference between the 1960' and 1980's actions?
Very interesting, again we are lucky to have a resource like your vintage airgun gallery.
Many Thanks Danny,
Matt.