Found a group of "unofficial" certificates from cruise lines; crossing Int. date line, equator, etc.

I found these certificates in a box full of ship cruise mementos of a couple/family who went on a LOT of cruises (there are a bunch of different passenger lists (they used to give everyone a list of every other passenger's name who would be on your ship?!), brochures & maps from unusual places like Uganda, Russia, the Artic, etc.. even one solar eclipse cruise they went on(!) and a lot more - it's a large box full.

The certificates are fun things (with Beautiful artwork on some!) for crossing the equator, crossing the international date line, etc.. Is there a name for these certificates in general (I found the Golden Dragon is for people who have crossed the Int. date line)?

It's been sitting in a closet for months now & I am thinking of selling the whole box on eBay to make some money - what would I call it; travel memorabilia?
Or if I sold the certificates separately as a group is there a name for what these are?
I am thinking of keeping the Swedish American Lines one with Neptune & the nude deco era looking lady (the dark blue one) - I think that one would look like beautiful art if framed!

Thank you!
PS - below are some of the other things I found - there's a lot more & hopefully I'll find more cool things to share!


HERE ARE SOME MORE FUN THINGS I FOUND JUST ON THE TOP LAYER - I HAVEN'T GONE THROUGH IT ALL YET; I LIKE THE "LONELY WIDOWS" PASSENGER LIST & THE GAME RESERVE MAP IS GORGOUS!

 

I think you should hold on to these for later years, when cruise ships become a vessel of the past.

 

Hi,
The only remembrance that I have when crossing the Equator is a small hole in my earlobe.
Got it in Neptune's Court when we crossed the Equator in a submarine in the 1950s.
greg

 

Thank you for your service!

 

I think that has already happened!