this is a common date circulated coin. you initial comment makes me believe that you do not know the costs of grading a coin. your coin appears to have been improperly stored and maybe in a pvc holder for a while. its a mid-AU coin with about a $50 value. I would suggest soaking it overnight in a 100% acetone bath. this can be purchased at a hardware store.
there are two reasons to slab a coin
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
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 $23, shipping & ins both ways (1-4 coins is $27 if the total value is under $1000)
NGC - economy grading tier is $22, 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.
CAC - $99 subscription ($50 grading credit), economy grading $15, gold $28, $40 shipping/handling/ins
i don't slab coins for these reasons especially the cost involved. I don't know why this is so popular today. just making the grading companies wealthy