当とう選せん券けん

と

う

せ

ん

け

ん

Meanings

1

noun

winning ticket

Refers to a ticket that has won a prize in a lottery, raffle, or similar drawing.

券けん

Standard modern spelling.

当とう籤せん券けん

Uses the older kanji 籤 (くじ). Rare in modern writing.

当とう選せん
当選 means 'winning' or 'being elected' in general, while 当選券 specifically refers to the physical winning ticket.
宝たからくじ
宝くじ is a lottery ticket in general, not necessarily a winning one.

Compound of 当選 (winning) + 券 (ticket).