How to say this is a precious chance to get sammy's autograph. in Japanese
1)
これはこれは(koreha) (exp) as for this/hey there/see here/i sayサミーno dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verbさんさん(san) (suf) mr, mrs, miss or ms/honorific used with occupational titlesのの(no) (prt) indicates possessive/nominalizes verbs and adjectives/substitutes for "ga" in subordinate phrases/indicates a confident conclusion/ indicates emotional emphasis/indicates questionサインサイン(sain) (n,vs) autograph/signature/sign/sineをを(wo) (prt) indicates direct object of action/indicates subject of causative expression/indicates an area traversed/indicates time over which action takes place/indicates point of departure or separation of action/indicates object of desire, like, hate,もらうもらう(morau) (v5u,vt) to receive/to take/to accept/to get somebody to do something貴重貴重(kichou) (adj-na,n) precious/valuableなな(na) (prt) connects adj to noun/indicates emotion or emphasis/command/prohibition機会機会(kikai) (n) chance/opportunityだだ(da) (aux) be/is/indicates past or completed action/indicates light imperative。。(。) Japanese period "."
