Feudor Midget 18k lighter

Known facts to me:

1. Feudor lighters were one of the first butane lighters (besides Flaminaire, ...?).
2. Besides cheaper models (1950 FRF), they were making solid gold ones for 93,000 FRF as seen on this ad.
3. $1 was worth from 350-420 FRF (1950-1958), so the price 93,000FRF was equivalent to $265 (1950) - $221(1958), which is $2480 (2011) - $1720 (2011) by CPI deflation
4. Price of troy ounce of gold was $18.93
5. 3. and 4. dont really matter, but are a nice info :)
6. The lighter weights 62g with empty gas tank
7. I got it without original box.

Questions:

1. How many different solid gold models of Midget series were there?
2. When was Midget produced?
3. Was Midget before Skyt or after?
4. What is a workaround of refilling the disposable gas canister?
5. What happened to Feudor that it wasn't more successful in the future?
6. What is the weight of inner mechanism + empty gas tank?
7. How do i find out more of this specific lighter?

Good