IPA symbol for the vowel in SSBE "got"

[Hulalessar]

My Collins Spanish-English English-Spanish Dictionary (1971) has the symbol /ɔ/ while my Collins English Dictionary (1991) has the symbol /ɒ/ for the vowel in Standard Southern British English <got>. Was the IPA revised between 1971 and 1991 or has there been a change of opinion as to which symbol is appropriate? If the latter, has there been a sound shift which I have failed to register?

 

[Awwal12]

Was the IPA revised between 1971 and 1991 or has there been a change of opinion as to which symbol is appropriate?

The latter, I bet. The only difference between the two is, essentially, the tongue's height ([ɒ] is open while [ɔ] is open-mid), so there's nothing surprising.

 

[Olaszinhok]

Pond (pɒnd) in RP English is pronounced like (or very similar to) the Italian open-mid [ɔ] to my ears.

 

[berndf]

My Collins Spanish-English English-Spanish Dictionary (1971) has the symbol /ɔ/ while my Collins English Dictionary (1991) has the symbol /ɒ/ for the vowel in Standard Southern British English <got>. Was the IPA revised between 1971 and 1991 or has there been a change of opinion as to which symbol is appropriate? If the latter, has there been a sound shift which I have failed to register?

A change in pronunciation but I would still prefer the transcription /ɒ/

There has been a certain counter clockwise shift of vowels in that area of the vowel space in modern SSBE; bat moving from /bæt/ towards /bat/, got from /gɒt/ towards /gɔt/ and fought from /fɔ:t/ towards /fo:t/. But I don't think the shift is strong enough to transcribe got as /gɔt/; at least not yet.