1977 C20 front axle identification

[yamaben]

I inherited a 1977 Chevy 3/4 ton. SM465 four speed and NP205 transfer case. I know exactly what the rear axle is (14 bolt GM full floater) but I don't have much experience with the front axle and I want to ID it so I can get the thing sold.

It has manual locking hubs and I thought this year and model would be a Dana 60, but someone told me it is not a Dana 60. Can someone please point me in the right direction to try to figure out what front axles were installed in this year and model and then identify what this one is?

This is a one owner truck and I personally know that the owner ordered this truck and had never swapped out the axle. This is definitely all original equipment. I posted links to pictures of the hub and diff cover.

https://imgur.com/lC5UjjK

https://imgur.com/n8n0Iw8

https://imgur.com/MEuyOqI