My holy grail...1928 hoadleys Don Bradman

Thanks.... I know it is a little unusual ... but we all have that one card that we always wanted ...
 
Nice work and it looks in pretty good condition for the age . What’s something like that worth?
 
AMAZING!

I picked up my long time wanted card 28-29 Ogden the other week (mailday coming soon) but I'm not really knowledgeable on Cricket cards - what made this a grail for you and/or so hard to find?
 
Is it similar to basketball where a player might have 5 first year (Rookie) cards and you could break them down to which was released first Like Topps came out in March then Upper Deck in April etc? Or is it thought of differently with cricket?