Welcome to the forum.

I am not a Premier expert,but I will try to help you a little.

You can look here to see if you can date the kit a bit closer

http://www.vintagedrumguide.com/premier.html

There is a catalogue scan of the 65 catalogue there.

Pics of the kit will really help,showing the badges,hardware like the tom holder on the Bass drum,the spurs on the bass drum, the throw off on the snare.The Diameter and depth of the individual drums is important,and if the finish on the snare matches the rest of the drums will affect value also,also on that note premier drums were metric sizes and then changed to international ie regular inch sizes on the diameters around the time your set was made.Other folks on here could help you more with that.

IMO whether they are international sizes or standard(inch sizes) will affect value more than what year they are in your case,Standard sizes will bring more dollars,if 1963 through 66 were all the same sizes ie metric or International the value will probably about the same.

As far as where to sell,E bay,craigs list,Reverb.com and the classifieds on this forum are all options

Welcome, and I'm sorry for you loss. Your dad apparently got a lot of pleasure from those drums. Did you click on manage attachments on the bottom of the page? From there a dialog box pops up which allows you the select jpgs from your computer for attachment. You have to know where those images are located, of course. Are you in the USA, the UK or Europe? By your language usage I'm guessing the US. Premier is a British brand available in the States but less popular than other vintage kits here. Some good pictures of the kit as a whole as well as close-ups, especially of the badges over the drum air holes would be useful. Attached is a link to Premier vintage drums on this site.

http://www.vintagedrumguide.com/premier.html

Worn heads are not very important to the value. Fading is also a normal consequence of a 50 year old vintage drum kit unless it's spent most of the time in storage.

Keep in mind the cymbals may also have significant value depending upon what they are. Try to get images of the stamps impressed into the cymbals themselves. They will be on the top side of the cymbals. They will be small, maybe an inch to an inch and a half in size, generally located closer to the edge rather than the bell of the cymbal. The stamp is very important when determining age and value.