I bought that camera for 300 marks back in the day.
In Germany, the mark was used before the introduction of the euro.
A ten-mark note turned up in the old wallet.
ユーロ is the current currency used in Germany today, whereas マルク refers to the currency it replaced.
Usual katakana spelling for this German loanword; this word is usually written in kana.
Rare ateji spelling given; not the normal modern spelling.
Borrowed from German Mark. The rare kanji spelling 馬克 is as phonetic ateji.