The spelling of the word "most oldie" is incorrect. The correct form is "oldest." The IPA phonetic transcription of this word is /ˈəʊldɪst/. It comprises of the vowel sound /əʊ/ (as in 'toe'), followed by the consonant sounds /l/ and /d/ (as in 'love' and 'do,' respectively), and finally the vowel sound /ɪ/ (as in 'it'). Therefore, the correct spelling must be used to convey the intended meaning accurately.