What does gpt show disk give you?
For instance, I just did another 500 GB drive and this is what you should get from gpt and diskutil (assumes /dev/disk1)
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diskutil list
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/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *111.8 Gi disk0
1: EFI 200.0 Mi disk0s1
2: Apple_HFS Macintosh HD 111.5 Gi disk0s2
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *465.8 Gi disk1
1: EFI 34.0 Mi disk1s1
2: Apple_Recovery 400.0 Mi disk1s2
3: Apple_HFS OSBoot 900.0 Mi disk1s3
4: Apple_HFS Media 464.3 Gi disk1s4
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diskutil unmountDisk /dev/disk1
sudo gpt show /dev/disk1
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start size index contents
0 1 PMBR
1 1 Pri GPT header
2 32 Pri GPT table
34 6
40 69632 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
69672 819200 2 GPT part - 5265636F-7665-11AA-AA11-00306543ECAC
888872 1843200 3 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
2732072 974041063 4 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
976773135 32 Sec GPT table
976773167 1 Sec GPT header