I have been clearing out our loft and discovered an old camera that I bought at a boot sale about 8 years ago.
I can't even remember what I paid for it. I have Googled it and it turns out it is a rather rare thing, only 100 or so made around 1909.
It is a Newman & Guardia Ltd Sibyl De Luxe1909. Looks like this:

It is in its original case and in good working condition, with about six plates for the 'negatives' and a leather holder for these plates.
I want to sell it to help fund an overseas trip. Any idea what it is worth and where I can sell it? I know Ebay is an option, but their fees are a joke!
I live near London, maybe a trip there to specialist antique shop might be worth it? Any help appreciated.

