I have taken another look.
Couple of interesting things:
(1) at the end credits the producers/distributor have listed the nationality of
all the male and female performers in the movie.
From Hungary they list: Timea, Regina, Beata, Mercedes, Roy Bridges.
They are accurate for these and other performers' nationality, so we are pretty safe in
stating this Mercedes is Hungarian (and that she was active around 1994-95).
(2) In the beginning credits, the producers have indicated the performers' names
along with a picture of the the person in a small circle/bubble.
The good news is that Mercedes is shown in full front face unobstructed view (which was not possible
to get/cap during the sex scene in question).
The bad news is that the photo in question is small, and not of very high quality.
Keep in mind the movie was released by VMD in VHS around 1995 or so.
But that is the best full face view you are going to get of her in this movie.
Here are the two caps the the Mercedes billing at beginning of movie
(unfortunately I am not a wiz kid in improving the sharpness of the pic, so
I can't be of help in this respect, maybe some expert in this forum can have a crack at it):
[IMG]http://img129.imagevenue.com/loc643/th_071450137_mercedes_09_123_643lo.jpg[/IMG]
[IMG]http://img235.imagevenue.com/loc260/th_071672473_mercedes_11_123_260lo.jpg[/IMG]