first, always take the coin out of the holder. it causes glare and obscures the surfaces.
second, its critical to see better photos of this coin without glare as this coin in AU would have sufficient value to slab it.
third, based on these photos the coin appears to have been polished. a big indicator that this occurred is the high points of the devices appear melted which I'm seeing here especially the obv. this could be photo related though and thats why its important to remove the coin
without better photos i'd call it AU details (cleaned/polished). if the coin was polished it would significantly affect the coins value. if it was just cleaned and not harsh only a small amount
two reasons to slab
1. its a rare coin that needs authenticated and preserved
2. you are planning on selling the coin and the cost of acquisition plus the grading fee's would warrant it without chewing up all your profit
consider grading costs prior to sending in.
PCGS charges a minimum of $69 for a subscription other subscription levels include grading vouchers though so you could reduce these costs. add to the subscription cost, per coin grading cost which I think for this one might be $22, shipping & ins both ways (1-4 coins is $27 if the total value is under $1000)
NGC - economy grading tier is $23, plus $10 handling fee, plus $28 for shipping (1-5 coins).
ANACS grading would be $16 but there's a 5 coin minimum. Shipping would be $29-35.