拙者 is read as せっしゃ (sessha) and means I.
せっしゃ
sessha
せつれつ
clumsy
せっそく
rough-and-ready
せっしゅ
poor defense
せっそくしゅぎ
slapdash approach
ほごしゃ
guardian
ふろうしゃ
vagrant
いなかもの
person from the countryside
じゅしゃ
attendant
せいじゃ
saint
いせいしゃ
statesman
だいさんしゃ
third party
だいいちにんしゃ
leading person