May I suggest you post this over on the 24 hour campfire forum under the Savage collectors and they will probably have alot of feedback for you.
To your questions about rarity:
303- no
3 piece take down- no
leather hard case- could be and lots of depends here.
condition- not rare but a big plus

The campfire boys will ask for pics so you may want to take them and post. If you can't postpics, then PM me and I can do for you.

There are a number of the members on the 24 who live in your fair country.